They say unto him, Lord, that our eyes may be opened. That is, that their sight might be restored to them; for being deprived of that, it was all one as if their eyes were so closed, that they could not open them; and so the recovery of it is expressed by an opening of them. The opening of the eyes of the blind was prophesied of, as what should be done in the days of the Messiah, and by him, as an evidence of his being that person, Isa 35:5 which prophecy these blind men might be acquainted with, and be an encouragement to their faith to expect a cure from him. They do not ask for alms, but for the recovery of their sight; which being granted, they would be able to get their bread in another way; for they were not like some idle persons that choose rather to be under such a calamity, or any other, that they might not be obliged to work with their hands for a livelihood. Their request shows, that they made no doubt of it, but firmly believed that Christ was able to do this for them, though the thing was impossible to be done by man; who therefore must conclude that he was not a mere man, but the Son of the living God.
Matthew 20:34

So the last shall be first, and the first last--that is, "Take heed lest by indulging the spirit of these murmurers at the penny given to the last hired, ye miss your own penny, though first in the vineyard; while the consciousness of having come in so late may inspire these last with such a humble frame, and such admiration of the grace that has hired and rewarded them at all, as will put them into the foremost place in the end."

for many be called, but few chosen--This is another of our Lord's terse and pregnant sayings, more than once uttered in different connections. (See Mat 19:30; Mat 22:14). The "calling" of which the New Testament almost invariably speaks is what divines call effectual calling, carrying with it a supernatural operation on the will to secure its consent. But that cannot be the meaning of it here; the "called" being emphatically distinguished from the "chosen." It can only mean here the "invited." And so the sense is, Many receive the invitations of the Gospel whom God has never "chosen to salvation through sanctification of the Spirit and belief of the truth" (Th2 2:13). But what, it may be asked, has this to do with the subject of our parable? Probably this--to teach us that men who have wrought in Christ's service all their days may, by the spirit which they manifest at the last, make it too evident that, as between God and their own souls, they never were chosen workmen at all.

Next: Matthew Chapter 21