Matthew 9:37

Then saith he unto his disciples
His heart being drawn out, and filled with pity to these poor people, upon observing the miserable and sad condition they were in; he turns himself to his disciples, whom he was about to call, and send forth in a more public manner to preach the Gospel, of which we read in the following chapter; and in order to quicken them to this service, and engage their hearts in it, says unto them,

the harvest truly is plenteous;
meaning the large number of God's elect, which were in these cities, towns, and villages, and in other places: not that these were maturely prepared by anything in themselves, or done by them, for the grace of God; and much less ripe for the kingdom of glory, and therefore called an harvest: but as there are the appointed weeks of the harvest, or a set time for the harvest to be gathered in, so there is a certain fixed time, settled in the counsel, and by the purpose of God, for the effectual calling and conversion of his elect; and this time being come, with respect to these in Galilee, and other parts, Christ calls them an "harvest"; and because of their number, a large, or "plenteous" one.

But the labourers are few:
Gospel ministers; whose calling is a laborious one; whose business is to labour in the word and doctrine; to be constant in prayer; to give up themselves to meditation and reading; to study to show themselves workmen; to preach the word in season, and out of season; and diligently discharge the several duties of their office, to the glory of Christ, and the good of souls: but such painful and laborious ministers, who are willing to spend, and be spent for Christ and immortal souls, have been but few in all ages; generally speaking, there are more loiterers than labourers.