Luke 10:1

Likewise also the twelve were reckoned by two and two, as Matthew shows in his enumeration of them. (Matt. 10:2.) For that two should be joined in service, seems from the word of God to be an ancient custom. For God led Israel out of Egypt by the hands of Moses and Aaron. Joshua and Caleb also, united together, appeased the people who had been provoked by the twelve spies. (Numb. 13, 14. Ex. 12.) Hence it is said, A brother assisted by a brother is as a fortified city. (Prov. 18:19. Vulg.)

At the same time it is implied by this, that if any are equal in spiritual gifts, they should not suffer a fondness for their own opinion to get the better of them.

But how does He give the name of harvest to a work only just now at its beginning? the plough not yet put down, nor the furrows turned, He yet speaks of harvests, for His disciples might waver and say, How can we so small a number convert the whole world, how can foolish men reform the wise, naked men those that are armed, subjects their rulers? Lest they should be disturbed then by such thoughts, He calls the Gospel a harvest; as if He says, All things are ready, I send you to a gathering of fruits already prepared. Ye can sow and reap the same day. As then the husbandman goes out to harvest rejoicing, much more also and with greater cheerfulness must you go out into the world. For this is the true harvest, which shows the fields all prepared for you. (Hom. 32. in Matt.) But he afterwards increased them greatly, not by adding to their number, but awarding to them power. He implies that it is a great gift to send labourers into the divine harvest, by His saying that the Lord of the harvest must be prayed to upon this account.

(de Quæst. Ev. 1. ii. q. 14.) As also in twenty-four hours the whole world moves round and receives light, so the mystery of enlightening the world by the Gospel of the Trinity, is hinted at in the seventy-two disciples. For three times twenty-four makes seventy-two. Now as no one doubts that the twelve Apostles foreshadowed the order of Bishops, so also we must know that these seventy-two represented the presbytery, (that is, the second order of priests.) Nevertheless, in the earliest times of the Church, as the Apostolical writings bear witness, both were called presbyters, both also called bishops, the former of these signifying "ripeness of wisdom," the latter, "diligence in the pastoral care."

God had made known by the Prophets that the preaching of the Gospel of salvation was to embrace not only Israel, but also the Gentile nations; and therefore after the twelve Apostles, there were other seventy-two (Vulg. septuaginta duos.) also appointed by Christ, as it is said, After these things the Lord appointed other seventy-two also. An outline of this ordinance also was set forth in the words of Moses, who at the command of God chose out seventy, upon whom God poured out His Spirit. In the book of Numbers also it was written of the children of Israel, that they came to Elim, which is by interpretation "ascent," and there were there twelve fountains of water, and seventy palm trees. (Numb. 33:9.) For when we fly to spiritual refreshment, we shall find twelve fountains, namely, the holy Apostles, from whom we imbibe the knowledge of salvation as from the well-springs of the Saviour; (Isai. 12:3.) and seventy palms, that is, those who were now appointed by Christ. For the palm is a tree of sound core, striking deep root and fruitful, always growing by the water side, yet at the same time putting forth its leaves upwards. It follows, And he sent them two and two. (non occ. v. Tit. Bost.) As the large fields require many reapers, so also do the multitude of believers in Christ. Hence He adds, Pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest. Now mark that when He said, Pray ye therefore the Lord of the harvest, that he would send forth labourers into the harvest, He afterwards Himself performed it. He then is the Lord of the harvest, and by Him, and together with Him, God the Father rules over all.