§10.37.1Ἔθισον ἐπὶ παντός, ὡς οἷόν τε, τοῦ πρασσομένου ὑπό τινος ἐπιζητεῖν κατὰ σαυτόν· οὗτος τοῦτο ἐπὶ τί ἀναφέρει; ἄρχου δὲ ἀπὸ σαυτοῦ καὶ σαυτὸν πρῶτον ἐξέταζε.
Accustom yourself, in the case of everything done by anyone, to inquire as far as possible by yourself: 'To what does this person refer this action?' But start with yourself, and examine yourself first.