Place in the book. A formula of happiness as a "good flow" (εὔροια), and two features that make the human soul akin to the soul of god. The discipline of desire.

The good flow. "You can always TERMflow well (εὐροεῖν), if you go by the right road (εὐοδεῖν) and TERMjudge methodically (ὁδῷ ὑπολαμβάνειν) and act." εὔρους βίος is the Stoic definition of happiness: not good luck, but the unerring, smooth working of reason in judgment and action.

Two common features. Two things are common to the soul of god, of man, and of every rational being: (1) DOGMA"not to be hindered by another" (μὴ ἐμποδίζεσθαι ὑπ' ἄλλου) — no one from outside can take away the freedom of the will; (2) to place the good in a TERMjust disposition and action and DOGMAthere to let desire (ὄρεξις) come to rest — that is, virtue is self-sufficient, and desire is aimed at it alone.

The discipline of desire. "There let ὄρεξις terminate" — Hadot's classic formula: to desire only what is up to me and is a genuine good (virtue), not the external. This is what secures εὔροια: a desire aimed only at the attainable-and-good never suffers shipwreck — and so the flow is "even."

Discipline and parallels. The principal discipline is desire (the confining of ὄρεξις to virtue); the secondary is assent (methodical judgment, ὁδῷ ὑπολαμβάνειν). Parallels: Epictetus Ench. 2 (on ὄρεξις / ἔκκλισις); 05-05 (the virtues are up to us); the doctrine of DOGMAthe self-sufficiency of virtue.