Epictetus, Works, book 0 28:

Ὁ Σωκράτησ ἔλεγεν "τί θέλετε; λογικῶν ψυχὰσ ἔχειν ἢ ἀλόγων; "λογικῶν". "τίνων λογικῶν; ὑγιῶν ἢ φαύλων; "ὑγιῶν. " "τί οὖν οὐ ζητεῖτε; "ὅτι ἔχομεν. " "τί οὖν μάχεσθε καὶ διαφέρεσθε;