Genre and place in the book. A passage of universal flux — the image of the MOTIFriver of time. After the disjunction of 6.10, the book returns to the physics of impermanence: since all is swept along by the current, clinging to the transient is senseless. The principal discipline is desire (non-attachment to the passing). A kin-passage to 06-04 (universal change).
Universal flux (ῥύσεις καὶ ἀλλοιώσεις). "Some things hurry to come to be, others to be gone; and of what has come to be, part is already quenched." "Flows and alterations (ῥύσεις καὶ ἀλλοιώσεις) renew the world without ceasing" — the Heraclitean flux applied to time: the unbroken course of time forever makes the boundless age (αἰών) young. Nothing abides. Cf. 04-43 (time a river of what comes to pass, a violent stream) and 05-23 (substance a river).
What to prize in the stream? "In this MOTIFriver, where there is no standing, what among the things racing past is to be prized high?" The therapeutic point: to cling to the passing is like "falling in love with a sparrow flitting by" (στρουθάριον, a diminutive — a homely, almost tender image) — and it is already gone from sight. Hence the discipline of desire: not to attach oneself to what by nature does not stay.
Life as breath. "Such too is each one's life — like the exhalation of blood (ἀναθυμίασις) and the breathing-in of air." Life is reduced to a breath: as it is to draw in once and breathe out — which we do every moment — so the whole respiratory power, received at birth "yesterday or the day before" (χθὲς καὶ πρῴην — that is, only just now; life is short), will have to be EXERCISEgiven back to the source from which it was first drawn. DOGMADeath is not a loss but the return of a loan; cf. the body-as-river and 06-04 (exhalation / dispersion).
Disciplines and parallels. The principal one is desire (contemplating the stream teaches non-attachment and a calm giving-back). Parallels: 04-43 (a river of what comes to pass); 05-23 (substance a river); 06-04 (all things change fast); Med. 2.17 (the body a river); the Heraclitean background — Heraclitus, fr. 12 DK. Doctrinally the image rests on the doctrine of transformation and feeds the acceptance of the flow.