Marcus quotes Epicurus. A rare cross-school gesture: a Stoic cites the head of a rival school as a model. In sickness PERSONEpicurus did not talk of "the sufferings of the poor body" (σωμάτιον) but kept doing physics (φυσιολογῶν), observing DOGMAhow the διάνοια, though sharing the motions in the "poor flesh" (σαρκίδιον), stays undisturbed (ἀταρακτεῖ), keeping its own good. Nor did he let the physicians preen as though doing something great. "Life went on well and beautifully."
Common to every school. Marcus's upshot: do the same — in sickness and in any περίστασις. Not to desert philosophy whatever befalls, and not to prattle with an ignorant man estranged from nature, is "common to every αἵρεσις" (school). The dry practical residue — EXERCISEto be with the one present task and the instrument you act with. The governing discipline is assent.