Place in the book. One of the "darkest" passages: epistemic uncertainty together with the transience and flux of all things — and against this background, two sober consolations. The disciplines are desire (the devaluing of externals, the awaiting of death) and assent (the changeability of judgment).
Incomprehensibility and the changeability of assent. Things are "enveloped" (ἐγκάλυψις) so that to not-a-few philosophers — and not undistinguished ones — they seemed altogether incomprehensible (ἀκατάληπτα); even to the Stoics, hard to comprehend (δυσκατάληπτα). And "all our TERMassent is changeable (μεταπτώτη) — where is the unchangeable one (ἀμετάπτωτος)?" A rare epistemological note in Marcus: even the Stoic criterion comes hard, and unwavering assent belongs to the sage alone.
The devaluing of things and people. Turn to the "underlying things" (ὑποκείμενα): short-lived, worthless, able to belong to a catamite, a whore, a robber. Then to the characters (ἤθη) of those around you: even the most agreeable is barely endurable — not to say that a man "scarcely endures himself." A bleak inventory that strips the price from the external.
Darkness, filth, flux. ζόφος, ῥύπος, and such a flux (ῥύσις) — of substance, time, motion, and things moved — that nothing can be "prized" (ἐκτιμηθῆναι) or an object of "serious pursuit" (σπουδασθῆναι). The Heraclitean flux devalues all that is transient. Cf. Med. 2.17 (02-17): "the substance is in flux" (οὐσία ῥέουσα).
The two consolations. (1) DOGMA"Nothing will befall me that is not according to the Nature of the Whole" — acceptance: what happens is inscribed in the rational order. (2) DOGMA"It is in my power to do nothing contrary to my god and daimon; no one will compel me" — the inviolability of the inner god. And between them: "EXERCISEawait the natural dissolution (φυσικὴ λύσις), without chafing at the delay." The very pair that seals Med. 2.17: the one thing that "guides" is philosophy, keeping the daimon unharmed.
Discipline and parallels. The principal discipline is desire (the devaluing of externals, acceptance of nature, readiness for death); the secondary is assent (the changeability of συγκατάθεσις). Parallels: Med. 2.17 (02-17) — the flux of substance and the guardian daimon.