John Chrysostom
But after that they had been sufficiently strengthened by His guidance, and had received competent proofs of His power, He sends them out, as it follows, And he sent them to preach the kingdom of God. And here we must remark, that they are not commissioned to speak of sensible things as Moses and the Prophets; for they promised a land and earthly goods, but these a kingdom, and whatsoever is contained in it.
Many things indeed He ordained hereby; first indeed it rendered the disciples unsuspected; secondly, it held them aloof from all care, so that they might give their whole study to the word; thirdly, it taught them their own proper virtue. But perhaps some one will say that the other things indeed are reasonable, but for what reason did He command them to have no scrip on their way, nor two coats, nor staff? In truth, because He wished to rouse them to all diligence, taking them away from all the cares of this life, that they might be occupied by the one single care of teaching.