Place in the book. On returning to philosophy after a lapse: the measure is not flawlessness but resumption. Philosophy here is not a stern overseer but a medicine. The disciplines are desire (the revaluation of the "agreeable") and assent (acting from correct δόγματα).
Not to despair at failure. Three negations: not to "be disgusted" (σικχαίνειν), not to "give up" (ἀπαυδᾶν), not to "sink into dejection" (ἀποδυσπετεῖν), if you do not manage to do everything from right principles. When "knocked back" (ἐκκρουσθέντα), return; be content if the greater part of your acts are "more human" (ἀνθρωπικώτερα); and love that to which you return. This is the Stoic προκοπή: what matters is the direction and the return, not the absence of error.
Philosophy as medicine. Return to her not as to a schoolmaster (παιδαγωγός, who is feared), but as those with sore eyes turn to the sponge and egg, to the poultice, to the douche. Philosophy heals, it does not examine; so you do not "make a display of obeying reason" but find your rest in TERMreason (προσαναπαύσῃ). The therapeutic model: a teaching is not a duty but a means of cure. Cf. Med. 3.13 (keep your principles ready, as a physician his instruments); Epictetus Disc. 3.23.30 (the philosopher's school is a hospital).
Philosophy wills what your nature wills. "Philosophy wills only what your TERMnature wills; but you wanted something else, DOGMAnot according to nature." What philosophy calls for is your own deepest constitution; to resist her is to be estranged from yourself.
The revaluation of the "agreeable." "What is more agreeable (προσηνέστερον)?" — TERMpleasure deceives precisely by seeming agreeable. But look: are not magnanimity, freedom, simplicity, fair-mindedness, piety more agreeable? And most agreeable of all is TERMwisdom (φρόνησις) itself, when you consider the "unerring and TERMsmooth-flowing" working of the EXERCISEfaculty of comprehension and knowledge (παρακολουθητικὴ δύναμις). Virtue is not an asceticism against pleasure but the higher pleasure: the εὔροια of the mind itself.
Discipline and parallels. The principal discipline is desire (the revaluation of the agreeable, contentment, acceptance of nature); the secondary is assent (correct δόγματα, obedience to reason). Parallels: Med. 3.13; Epictetus Disc. 1.1 (the παρακολουθητικὴ δύναμις), 3.23.30 (philosophy as a hospital).