4 And not even at this does He stop, but He exhibits also another instance of His forethought. That is,
“When He saw,” it is said, “the multitudes, He was moved with compassion on them, because they were troubled, and scattered abroad, as sheep having no shepherd. Then says He unto His disciples, The harvest truly is plenteous, but the laborers are few, pray ye therefore the Lord of the harvest, that He will send forth laborers into His harvest.”
See again His freedom from vainglory. That He may not draw all men unto Himself, He sends out His disciples.
And not with this view only, but that He might also teach them, after practising in Palestine, as in a sort of training-school, to strip themselves for their conflicts with the world. For this purpose then He makes the exercises even more serious than the actual conflicts, so far as pertained to their own virtue; that they might more easily engage in the struggles that were to ensue; as it were a sort of tender nestlings whom He was at length leading out to fly. And for the present He makes them physicians of bodies, dispensing to them afterwards the cure of the soul, which is the principal thing.
And mark how He points out the facility and necessity of the thing. For what says He? “The harvest truly is plenteous, but the laborers are few.” That is, “not to the sowing,” says He, “but to the reaping do I send you.” Which in John He expressed by, “Other men labored, and you are entered into their labors.”
And these things he said, at once repressing their pride, and preparing them to be of good courage, and signifying that the greater part of the labor came first.
And contemplate Him here too beginning from love to man, not with any requital. “For He had compassion, because they were troubled and scattered abroad as sheep having no shepherd.” This is His charge against the rulers of the Jews, that being shepherds they acted the part of wolves. For so far from amending the multitude, they even marred their progress. For instance, when they were marvelling and saying, “It was never so seen in Israel:” these were affirming the contrary, “He casts out devils through the prince of the devils.”
But of what laborers does He speak here? Of the twelve disciples. What then? Whereas He had said, “But the laborers are few,” did He add to their number? By no means, but He sent them out alone. Wherefore then did He say, “Pray ye the Lord of the harvest, that He would send forth laborers into His harvest;” and made no addition to their number? Because though they were but twelve, He made them many from that time forward, not by adding to their number, but by giving them power.
Then to signify how great the gift is, He says, “Pray ye the Lord of the harvest;” and indirectly declares it to be His own prerogative. For after having said, “Pray ye the Lord of the harvest;” when they had not made any entreaty nor prayer, He Himself at once ordains them, reminding them also of the sayings of John, of the threshing floor, and of the Person winnowing, and of the chaff, and of the wheat. Whence it is evident that Himself is the husbandman, Himself the Lord of the harvest, Himself the master and owner of the prophets. For if He sent them to reap, clearly it was not to reap what belongs to another, but what Himself had sown by the prophets.
But not in this way only was He indirectly encouraging them, in calling their ministry a harvest; but also by making them able for the ministry.
“And when He had called unto Him,” it says, “His twelve disciples, He gave them power against unclean spirits, to cast them out, and to heal all manner of sickness, and all manner of disease.”
Still the Spirit was not yet given. For “there was not yet,” it says, “a Spirit, because that Jesus was not yet glorified.” How then did they cast out the spirits? By His command, by His authority.
And mark, I pray you, also, how well timed was the mission. For not at the beginning did He send them; but when they had enjoyed sufficiently the advantage of following Him, and had seen a dead person raised, and the sea rebuked, and devils expelled, and a paralytic new-strung, and sins remitted, and a leper cleansed, and had received a sufficient proof of His power, both by deeds and words, then He sends them forth: and not to dangerous acts, for as yet there was no danger in Palestine, but they had only to stand against evil speakings. However, even of this He forewarns them, I mean of their perils; preparing them even before the time, and making them feel as in conflict by His continual predictions of that sort.
Source: Homilies on the Gospel of St. Matthew (New Advent)