Cyril of Alexandria
Catena Aurea · Lukasevangelium 10
After these things the Lord appointed other seventy also, and sent them two and two before his face into every city and place, whither he himself would come. Therefore said he unto them, The harvest truly is great, but the labourers are few: pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest. 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.