When we put bits into the mouths of horses to make them obey us, we can guide the whole animal.
Ἰδού, τῶν ἵππων τοὺς χαλινοὺς εἰς τὰ στόματα βάλλομεν πρὸς τὸ πείθεσθαι αὐτοὺς ἡμῖν, καὶ ὅλον τὸ σῶμα αὐτῶν μετάγομεν.