No one takes this honor upon himself; he must be called by God, just as Aaron was.
Καὶ οὐχ ἑαυτῷ τις λαμβάνει τὴν τιμήν, ἀλλὰ ὁ καλούμενος ὑπὸ τοῦ Θεοῦ, καθάπερ καὶ ὁ Ἀαρών.