[39] And he will not go to Egypt, nor will he descend into the arena to strive against the sophists who contend in it, till he has thoroughly studied and practised the art of argumentative reasoning; God himself showing to him all the ideas which belong to such elocution, and making him perfect in them by the election of Aaron who was the brother of Moses, and whom he was accustomed to call his mouth-piece, and interpreter, and prophet. [29]