Genre and place in the book. A maxim of intellectual honesty — the readiness to be corrected. The principal discipline is assent (to change one's TERMjudgment for the sake of truth); the sustaining one is action (to act rightly). It continues 6.20: there, not to be hostile to one who jostles you; here, to rejoice in one who refutes you.

"I will gladly change" (χαίρων μεταθήσομαι). If someone "refutes" me (ἐλέγξαι) and shows that I judge or act wrongly, I will change gladly (χαίρων). Not defensiveness but joy at correction: one who seeks the truth (ἀλήθεια), not victory, meets refutation as a gift. To change one's opinion is not weakness but freedom, and one's own activity (cf. Med. 8.16).

The truth harms no one (οὐδεὶς ἐβλάβη). "By the truth no one was ever harmed." The logic of DOGMAinvulnerability is turned toward self-knowledge: to be corrected is no harm (the supposed "defeat" of self-love is not harm); the harm is in persisting (ἐπιμένων) in one's own "deception" (ἀπάτη) and TERMignorance (ἀγνοία). Real injury is done by the one who clings to his error; he is undone not by another's refutation but by his own obstinacy.

Disciplines and parallels. The principal one is assent (to change one's judgment by the truth); the secondary is action (for "act" — πράσσω — is under examination too). Parallels: Med. 4.12; 8.16 (the readiness to be corrected = freedom); 02-01 (they err through TERMignorance of good and evil); the doctrine — DOGMAno harm can come to the virtuous (harm is only one's own error).