§5.14.1Ὁ λόγος καὶ ἡ λογικὴ τέχνη δυνάμεις εἰσὶν ἑαυταῖς ἀρκούμεναι καὶ τοῖς καθ’ ἑαυτὰς ἔργοις.
Reason and the art of reasoning are faculties self-sufficient for themselves and for their own proper works.
ὁρμῶνται μὲν οὖν ἀπὸ τῆς οἰκείας ἀρχῆς, ὁδεύουσι δὲ εἰς τὸ προκείμενον τέλος, καθὸ κατορθώσεις αἱ τοιαῦται πράξεις ὀνομάζονται τὴν ὀρθότητα τῆς ὁδοῦ σημαίνουσαι.
They start from their own proper beginning and proceed to the end set before them, wherefore such actions are called "right actions," indicating the rightness of the path.