Place in the book. On detachment from another's wrongdoing and fidelity to one's own double nature. The discipline of action (one's own task), with a secondary of desire (accepting what the common nature gives).
Another's fault is not mine. "Does another TERMdo wrong to me? Let him look to it (ὄψεται)." He has his own disposition (διάθεσις) and his own activity (ἐνέργεια); DOGMAanother's vice is not up to me and (by the doctrine of invulnerability) does me no harm. He errs through ignorance — so not "I am indignant" but "that is his affair."
The two natures. "I now have what TERMthe common nature (κοινὴ φύσις) wills me to have, and I do what TERMmy own (ἐμὴ φύσις) wills." This is the core of the telos-formula DOGMA"to live according to nature" in its Chrysippean double redaction: to accept one's lot from the Whole (desire) and to fulfil one's rational-social task (action) — and the two natures do not conflict, since my nature just is "to be a part" of the cosmic one. The threefold "now" (νῦν): all is gathered into the present.
Discipline and parallels. The principal discipline is action (one's own task according to one's nature; the treatment of the wrongdoer); the secondary is desire (accepting what the common nature gives). Parallels: 05-03 (the same ἰδία / κοινὴ φύσις formula), Med. 8.56; 9.20 (another's fault is his, not mine).