A formula already seen, and words not yet said. ὅτι πάντα TERMὑπόληψις stood last in the checklist of 12.8. Here it is placed first — and to it is added the thing the entry exists for: καὶ αὕτη ἐπὶ σοί, "and this is in your power." Without that addition, "everything is opinion" would be only a theory of knowledge; with it, it becomes the DOGMAdichotomy and acquires a lever.

The verb. ἆρον is the imperative of αἴρω, "to lift, to take off, to remove"; the same verb stands twice in 4.7: ἆρον τὴν ὑπόληψιν, ἦρται τὸ «βέβλαμμαι». Not "refute" and not "talk yourself round," but precisely lift it off — as one lifts off something laid on top. And the qualification ὅτε θέλεις, "when you will," is not a claim about ease but about jurisdiction: the matter is settled by your decision and not another's.

A sailor's image, and an exact one. κάμψαντι τὴν ἄκραν — "to one who has rounded the headland." In sailing this is an instantaneous transition: while you run along the exposed side there is swell and wind; the moment you double the point you come into the lee. What matters is that the sea has not changed — your position relative to it has.

Three words of stillness — and not one verb. TERMγαλήνη (a flat calm), σταθερὰ πάντα (everything steady), κόλπος ἀκύμων (a bay without a wave). In Greek this is a nominal close: Marcus promises no "you will find" — he simply names the state one is then in. Both Rogovin and Long insert a verb ("you will obtain," "thou wilt find"), which introduces a reward for effort that the text does not offer. Cf. 5.2 (throw off the impression and be at once "in complete calm"), 7.33 and 8.28, where γαλήνη is the mind's own state, depending on nothing outside. The governing discipline is assent, the sustaining one desire.