Upon those who step into the same rivers, other and other waters flow. — Heraclitus, fragment B12

The tree is not obliged to become the table; the child, if he goes on, cannot remain frozen as the child he now is. One necessity binds a relation and the other a temporal life — and the subject stands under neither as under its ground.


Contents



Note on Sources and Method

This essay takes up the question left standing at the end of Who Was Before Me, or Myself? — if there is one self across earlier and later phases, and no earlier self behind it, what kind of necessity binds those phases into a single temporal life? — and answers it by unbundling a word. The word is must. The corpus has made this move before, on before and on beginningless; here it finds must doing two different jobs, a conditional necessity and a constitutive one, and the whole essay is the prying of them apart. It presupposes rather than re-derives four prior essays: Who Was Before Me, or Myself?, for the distinction between derivation and traversal; The Infinite Interior, for persistence as a continuous interior crossed without a seam; The Am That Remains, for the soul as the subject in which the temporal loops occur and not as their product; and Two Meanings of ‘Is’, for the distinction between what makes existence intelligible and what sustains it. It draws, in its last movements, on The Is and the AM, The Angle of Reception, and The Artificial Selection. Where the argument touches the soul’s subsistence it marks, as the corpus always marks, the line between a philosophical proposition and a doctrinal reading, and claims only the weaker and surer form. Heidegger is engaged here as an interlocutor whose question was right and whose answer this essay declines; he is company on the road, not an authority from which the argument descends, and the same holds of Aristotle, Augustine, and Aquinas.


Abstract

A living, embodied subject does not continue its temporal life by remaining frozen in one phase, nor by being replaced by a later subject. If it persists in life, it persists through changing phases as one numerically continuous subject; in this sense traversal is necessary to continued temporal life. But the necessity is conditional, not constitutive. Traversal is not what the subject is, nor the ground by which it exists; it is the temporal mode through which an already numerically continuous embodied subject persists. On the doctrinal reading invoked later, the subsistence of the rational soul when bodily traversal ceases supplies a negative counterexample to identifying the subject’s being with that traversal. The essay secures this by prying apart two senses of must, and then broadens the point against the temptation to make becoming a private glory of selves: the living tree traverses, the chicken traverses, the human person traverses — traversal is the common form of the persistence of living, embodied things, and the stone at its edge, which may persist without altering, marks just how far the claim reaches and no farther. Two guardrails hold the conditional sense in place: The Am That Remains, which finds the subject underneath the loops and not constituted by them, and Two Meanings of ‘Is’, which finds that the temporal surface explains a thing’s urgency but never its actuality. The distinctively personal question opens only after the distinction is secured. A person does not merely undergo the becoming through which temporal persistence occurs; at the crossing point the person can receive, answer, and orient it. Becoming is unavoidable as the form of temporal persistence; presence within that becoming is not. The self cannot refuse its becoming — but it can, within the freedom available to it, refuse to inhabit it, and be carried through its own passage absent from its own crossing.


I. The Tree That Does Not Have to Become the Table

Who Was Before Me, or Myself? fixed a distinction this essay now puts to work. A table comes from a tree by derivation: one subject gives rise to a second, numerically distinct subject, and the first is in no way obliged to become the second. A chicken comes from the egg it hatched from, and a man from the boy he was, by traversal: one numerically continuous subject passing through its own phases, with no second subject anywhere in the passage. The two relations answer the question what was before? in opposite ways — derivation leaves an earlier thing behind it, traversal leaves only an earlier phase of the same thing — and that was the earlier essay’s business.

But set the two relations side by side under a different question — not what was before? but what is required? — and an asymmetry appears that the earlier essay did not need. Derivation is optional for its source. The tree need not ever become a table; it may stand, fall, rot, or burn, and it fails in none of these at being a tree, because tablehood was never a phase of treehood but the career of a second subject. Traversal is not optional in the same way. A living continuant that persists in time does not get to decline its later phases and stay frozen at an earlier one; to go on living at all is to go on as changed. The tree is not obliged to become the table. The child, if he is to go on being, cannot remain frozen as the child he now is.

Here the earlier essay’s own result sharpens the question rather than answering it. If there is only one self across its phases, and no earlier self standing behind the present one, then what exactly is the force of that cannot — why can a single subject not simply persist by staying as it is? The scratch intuition that provoked this essay reached for a bold answer: that the self, unlike the tree, is its becoming, that change is constitutive of it. That answer overreaches, and the corpus already forbids it. The sober answer is more exact, and getting it exact requires seeing that the word doing the work — must — is doing two jobs at once.


II. Two Meanings of Must

When we say the self must traverse, we may mean either of two things, and they are not the same claim wearing one word. The first is a conditional necessity: if a living, embodied subject persists in temporal existence, its persistence cannot consist in retaining one and the same phase unchanged — to continue is to pass into later phases, not to hold the present one frozen. This says nothing about whether the subject must exist, or what it is; it says only that, given such persistence, its mode is becoming. The second is a constitutive necessity: that the subject simply is its becoming — that change is not the mode of its persistence but the very stuff and ground of its being, so that where the changing stops, the subject stops.

The first sense is true, and the rest of this essay defends it. The second is false, and the rest of this essay is built to keep the first from collapsing into it. The collapse is easy and tempting, because the conditional claim, stated quickly, sounds like the constitutive one — a self that does not change is not a self can be heard either way. Heard conditionally it says: no living temporal persistence runs by freezing a phase. Heard constitutively it says: subtract the change and nothing is left. The corpus has spent whole essays establishing that something is left. So the discipline from here is the discipline the corpus kept with before and with beginningless: one word, two jobs, held apart on pain of the confusions that follow when a single term is let do the work of two.


III. What Must Traverse

Before the two necessities can be told apart cleanly, a false step in the provoking intuition must be removed, because it hides the real asymmetry behind a wrong one. The intuition set the tree against the self — the tree may remain unchanged and still be itself, the self may not. But a living tree may not remain unchanged either. It was a seed, a sapling, a spreading canopy; it exchanges its matter, loses and grows its parts, ages. A tree that persisted for a century by holding a single frozen state would not be a hardier tree but a dead one, or no tree at all. Whatever the conditional necessity is, it does not single out the self. The chicken falls under it, as Who Was Before Me already showed; so does the tree; so does every living, embodied thing whose persistence is a life and not a mere endurance.

So the asymmetry the intuition felt is real but misplaced. It is not an asymmetry between two kinds of being, the changeless tree and the mutable self. It is an asymmetry between two relations: derivation, which never obliges its source to become anything, and traversal, which obliges a living, embodied continuant to become its later phases. The qualification earns its keep at the boundary. A stone may persist across an interval without altering in any respect; its sameness requires no passage of phases, and it stands at the edge of the account as the case of persistence that is not traversal at all. What cannot persist by freezing its present state is a life — the tree’s, the chicken’s, the embodied person’s — because a life holding a single state unchanged would not be a life more securely kept but a life ended. So the necessity is not of every temporal thing as such; it is of the living, embodied continuant, whose continuing is a becoming and not a holding. This costs the self its imagined privilege and thereby earns the one it actually has. Traversal is not what is special about selves. It is the common form of the persistence of living, embodied things, and if the person is distinctive, the distinction must be found somewhere other than in the mere fact that it changes.


IV. The Subject Is Not the Traversal

The first guardrail against the constitutive reading is The Am That Remains, and it is decisive. That essay took Descartes’ therefore to be the error: the thinking was real, but it was the activity of a subject, not the subject’s ground. The loops of memory and anticipation run on something; they require a soul in which they occur, as a current requires the river it runs in. Remove the current and the river does not cease; remove the thinking and the soul does not cease. What ceases is the activity. Hence the correction the corpus has carried ever since: not I am because I think, but I think because I am — and I am whether I think or not.

Turn this on traversal and the constitutive reading falls. Traversal is the temporal mode of the embodied subject’s persistence — the succession of phases through which it continues — and it stands to the subject as the thinking does: its mode while it runs, not its ground. On the classical reading of the soul’s subsistence — which this essay takes as a doctrinal reading and not a demonstrated one — the death case does exactly one thing, and the essay asks it to do no more. When the body is set down, the temporal apparatus of succession falls silent, deliberation and discursive movement stop; and on that reading the rational soul subsists. The inference is narrow and purely negative: a subject whose being were constituted by its traversal could not outlast the stopping of its traversal — so traversal does not constitute the subject’s being. It is a reductio of the reduction, nothing more. It does not pronounce on what relation the separated soul then has to time, and it emphatically does not say that the complete human person persists as a self without a body; the hylomorphic discipline of the previous essay holds, body and soul one nature. It says only this, which is enough: the being of the rational soul is not constituted by bodily temporal traversal. The subject is that which traverses — not the traversing.

And traversal does not establish numerical identity; it is the temporal mode through which an already numerically continuous subject persists — the sameness itself secured, not here, but in The Infinite Interior, by the continuity of an interior crossed without a seam. This essay inherits that one subject and asks only how it goes on in time; it does not ask traversal to manufacture the oneness it presupposes.


V. The Surface Is Not the Ground

The second guardrail is independent of the first, and blocks the same error from the side of ground rather than of endurance. Two Meanings of ‘Is’ distinguished what a word can be asked to do — make existence intelligible and make it actual — and showed that temporality supplies the first without supplying the second: the horizon explains why finite existence feels urgent, not what keeps it actual. Intelligibility and sustenance are not the same problem, and the ground is not ahead on the temporal surface but at the center that holds the surface from ceasing — the Now held open by the non-derivative I AM WHO I AM.

Lay that beside the present question and the transfer is exact: if temporal structure does not ground being, becoming does not ground the subject. Even granting that traversal is the temporal mode of the self’s persistence, the mode is still surface and not ground; to make becoming the self’s ground is to make the temporal surface supply its own actuality, the very move Two Meanings refused in Heidegger’s register. So the sentence the scratch intuition reached for — the ‘I’ is the continuity of change — must be retired for good; it is not merely at odds with The Am That Remains, it walks back toward the reduction Two Meanings had already declined, letting temporal structure become the account of what the subject is. Two essays, two roads, one verdict: the self traverses, the self is sustained, and the traversing is not the sustaining.


VI. Necessary Form, Contingent Path

With the constitutive reading set aside, the conditional necessity can be stated at its true strength — and its true strength is narrower than the intuition supposed in a second way. Traversal is necessary to continued temporal life; but no particular later phase is necessary. The child need not become the adult: a child may die first, and a life cut short is not a life that failed a requirement. Nothing in the modal structure reserves adulthood ahead as a destination the child is bound to actualize. What is necessary is only this: if the subject persists to a later phase, it does not do so by remaining frozen at the present one; it persists by becoming otherwise than it now is, along whichever of its possible trajectories becomes actual.

This is the corpus’s own axiom in its native place: possibility is plural, actuality singular. Necessity belongs to traversal as form — that persistence, if it continues, continues as change — and never to the contents of the trajectory, which stay contingent to the end. The intuition’s the child must become the adult smuggled a destination into a modal law that licenses none. The law says only that the one who goes on goes on as changed, and leaves wholly open what he changes into.


VII. The Becoming I Cannot Refuse

Everything said so far is true of the tree and the chicken as much as of the person, and it yields the first half of the personal condition without yet reaching what is personal in it. While a living subject is in time, the becoming that is the form of its persistence is not on offer for acceptance or refusal. It is given, in the way the Now is given — handed, not chosen. One does not elect to traverse and then set about it; to be an embodied continuant in time at all is already to be underway, already crossing the interior of one’s own change without having consented to the crossing. The child does not decide to stop being the child; he finds he has gone on, and the going-on was never a motion he could decline while still living it.

This is the becoming no one can refuse, and it is worth naming as such before the turn, because the ethical weight of the essay lies entirely in a distinction it makes possible. What cannot be refused is the traversal — that one is carried, while alive and in time, through one’s successive phases. A tree’s aging and a chicken’s maturing share in that unchosen carrying, each in its own manner. The question that is left, and that is the only distinctively personal question, is not whether one will traverse. It is what, if anything, one does at the crossing one is already being carried through.


VIII. The Becoming I Can Inhabit

Here two levels must be held apart that the intuition ran together. Traversal is undergone — by every living temporal continuant, the person included. Orientation is enacted — by the personal subject, within the traversal it undergoes. The tree is carried through its phases without personally appropriating them; it traverses, but does not inhabit the crossing in the personal sense at issue here. The person is carried through his phases too, but at each the crossing is a place he can occupy: he can receive what arrives there, answer it, and set by his answer the direction the next phase inherits. This is the micro-gap of The Is and the AM — the lived room between what impulse would make of the moment and what the will enacts in it — and it is not decoration on the account of persistence. It is not what makes the subject persist; the subject would persist, carried, without ever inhabiting a single crossing. It is where the subject appropriates the becoming it cannot avoid.

So the personal addition is not a second necessity laid over the first but a freedom opened within it, and it is best stated as a single sentence the scratch notes were reaching for and had not found: I cannot choose whether temporal persistence will require becoming; I can, within limits, choose how I receive and orient the becoming through which I persist. That is the reception the corpus named elsewhere — the world met at an angle, taken in and answered rather than merely suffered — brought now to a person’s own passage through himself. The becoming is the given; the inhabiting is the act; and the whole dignity and the whole peril of a temporal life is that the second is not supplied by the first. A life can be richly traversed and thinly inhabited. The phases continue to become actual whether or not anyone is at the crossing to meet them.


IX. The Uninhabited Traversal

This is exactly the danger The Artificial Selection diagnosed, and the present distinction tells why it is a danger and not merely a loss. The danger was never that traversal could be abolished — it cannot; the phases continue, the clock does not stop for anyone, and no engineering reaches the fact that a living temporal subject goes on becoming. The danger is that a subject can be insulated, more and more completely, from the encounters through which its becoming would otherwise demand presence — reception, answer, orientation — until it is carried through its passage without ever standing at the crossing. That is the uninhabited Now under another name: a traversal fully undergone and never inhabited, a life undergone by someone who was never fully present to it. Put as a formula it is the essay’s sharpest sentence: the self cannot refuse its becoming; it can refuse to inhabit its becoming. The refusal names only what lies within the freedom available to a given life; much absence from the crossing is not refusal at all but incapacity — sleep, coercion, diminished or not-yet-grown agency, the long dimming of illness — and belongs to a different account than the one at issue here. Where there is freedom, the refusal does not halt the traversal, for nothing halts it short of death, nor does it make the subject any less the one numerically continuous subject it was: the subject absent from its own crossings remains unmistakably the one whose life is being lived. What the refusal forfeits is not persistence but presence — the one thing the person could have added at the crossing, and the one thing nothing and no one could add in his place.



X. The One Who Remains

The pieces now stand in order, and they compose a map the corpus has been drawing one essay at a time. There is the question of origin — why there is this subject at all — answered in Who Was Before Me, or Myself?: no earlier self behind it, only a beginning given. There is the question of ground — why this subject is actual — answered across the temporal sequence and in Two Meanings of ‘Is’: not the surface sustaining itself, but the Now held open by the non-derivative. There is the question of persistence — why the earlier and later phases are one subject — answered in The Infinite Interior: one continuant crossing its own interior without a seam. This essay adds the fourth, traversal: how that persistence occurs while the subject is in time — through becoming, not despite it, as the conditional form of a living temporal life and never as its ground. And with the fourth it opens the fifth, orientation: what the personal subject does within the becoming it cannot avoid — receive it, answer it, inhabit the crossing, or be carried through absent.

So the one who asked, in the earlier essay, what was before him, and found no earlier self, can be told now what binds his phases into one life, and it is not that he is his own becoming. He is the subject of a becoming he did not choose and cannot decline while he lives, sustained the while by what his becoming does not supply, and free, at the crossing, in the one respect that is his to be free in. The self does not have to become in order to be a self; the permanence at issue was never stasis, and the subject’s numerical identity is not supplied by its phases, even though its embodied temporal persistence unfolds through them. But while the embodied self persists in time, it cannot persist except through becoming — and it can either inhabit that becoming or be carried through it, absent from its own crossing. Heraclitus was right about the waters: other and other waters flow upon the one who steps in. The topology adds only what the river image does not decide — that the one who steps in is not the water, does not flow away with it, and may, if he will, be present to the current that is, after all, his own life passing.


References

Scripture: The Holy Bible, Revised Standard Version, Second Catholic Edition (Ignatius Press, 2006): Exodus 3:14.

Philosophical and Theological Sources

  • Heraclitus. Fragments. (Fragment B12, Diels–Kranz, the river image, distinguished here from the later doxographic summary πάντα ῥεῖ; the English rendering in the epigraph is the author’s translation.)
  • Aristotle. Physics. Translated by Robin Waterfield. Oxford University Press, 1996. (On substance, change, and the enduring subject.)
  • Augustine of Hippo. Confessions. Translated by Henry Chadwick. Oxford University Press, 1991. (Book XI, on time and the present.)
  • Aquinas, Thomas. Summa Theologiae. Translated by the Fathers of the English Dominican Province. Benziger Bros., 1947. (I, q. 75–76, on the subsistence of the soul and its union with the body as its form.)
  • Heidegger, Martin. Being and Time. Translated by John Macquarrie and Edward Robinson. Harper & Row, 1962. (Ecstatic temporality and Being-toward-death; engaged as interlocutor.)

Author’s Prior Works in This Sequence

  • Gaitan, Oscar. Who Was Before Me, or Myself? On the Three Questions Hidden in “Before,” the Self Without an Earlier Self, and the Beginning That Is Not a Before. 2026.
  • Gaitan, Oscar. The Infinite Interior: On Space, Change, and the Integrity of the Self. 2026.
  • Gaitan, Oscar. The Am That Remains: A Critique of Descartes and a Metaphysics of the Soul. 2026.
  • Gaitan, Oscar. Two Meanings of ‘Is’: Heidegger’s Horizon and the Crossing Point. 2026.
  • Gaitan, Oscar. The Is and the AM: Presence, Identity, and the Ground That Holds. 2026.
  • Gaitan, Oscar. The Angle of Reception: On Encounter, Curvature, and the World Received Through a Bent Interior. 2026.
  • Gaitan, Oscar. The Artificial Selection: On Endurance, Identity, and the Engineering of an Uninhabited Now. 2026.
  • Gaitan, Oscar. Does Time Need Me, or Do I Need Time? The Ontology of the Now, the Invariance of Presence, and the Ground of Being. 2026.