Luke 10:4

Our Lord did not then forbid these things because the exercise of benevolence was displeasing to Him, but because the motive of following after devotedness was more pleasing. Our Lord also would have nothing human in us. For Moses is bid to loose off the human and earthly shoe when he was sent to deliver the people. (Exod. 3:5) But if any one is perplexed why in Egypt we are ordered to eat the lamb with shoes on, (Exod. 12:11.) but the Apostles are appointed to preach the Gospel without shoes: he must consider, that one in Egypt ought still to beware of the serpent's bite, for there were many poisonous creatures in Egypt. And he who celebrates the Passover in figure may be exposed to the wound, but the minister of truth fears no poison.

And He also forbade all care about what is external to the body, by saying, Take neither purse nor scrip. Nor did He allow men to take with them any of those things which were not attached to the body. Hence He adds, Nor shoes. He not only forbade them to take purse and scrip, but He did not allow them to receive any distraction in their work, such as interruption by greetings on their way. Hence He adds, Salute no one by the way. Which had long ago been said by Elisha. (2 Kings. 4:29.) As if He said, Proceed straight on to your work without exchanging blessings with others. For it is a loss to waste the time which is fitter for preaching, in unnecessary things.

(ubi sup.) Now every one who salutes on the way does so from the accident of the journey, not for the sake of wishing health. He then who not from love of a heavenly country, but from seeking reward, preaches salvation to his hearers, does as it were salute on the journey, since accidentally, not from any fixed intention, he desires the salvation of his hearers.

(Orat. 2.) The sum of which is, that men ought to be so virtuous that the Gospel should make no less progress through their way of life than their preaching. (ubi sup.) The Lord gave them these commands also for the glory of the word, lest it should seem that enticements could more prevail over them. He wished them also not to be anxious to speak to others.

(Hom. 33. in Matt.) For their comfort amid every danger was the power of Him who sent them. And therefore saith He, Behold, I send you; as if he said, This will suffice for your consolation, this will be enough to make you hope, instead of fearing the coming evils which He signifies, adding, as lambs among wolves. (Hom. 33 in Matt.) For this was a clear announcement of glorious triumph, that the disciples of Christ, when surrounded by their enemies as lambs among wolves, should still convert them.