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V B 419
V B 419 DIOG. LAERT. VI 68:
εἰπόντος τινὸς ὅτι ὑπὸ τῶν φίλων ἐπιβουλεύεται, "καὶ τί δεῖ πράττειν," ἔφη [scil. Diogenes], "εἰ δεήσει τοῖς φίλοις καὶ τοῖς ἐχθροῖς ὁμοίως χρῆσθαι;"