Luke 20:13

Now it was not accidentally but part of the purpose of the divine dispensation that Christ came after the prophets. For God does not pursue all things at once, but accommodates Himself to mankind through His great mercy; for if they despised His Son coming after His servants, much less would they have heard Him before. For they who listened not to the inferior commands, how would they have heard the greater?

The Lord of the vineyard also ponders what He should do, not that He is in need of ministers, but that having thoroughly tried every device of human aid, yet His people being in no wise healed, He may add something greater; as He goes on to say, I will send my beloved son: it may be they will reverence him when they see him.

After the prophets then had suffered all these things, the Son is delegated; for it follows, Then said the Lord of the vineyard, What shall I do? That the Lord of the vineyard speaks doubtingly, arises not from ignorance, for what is there that the Lord knows not? but He is said to hesitate, that the free will of man may be preserved. Now He said this, not as ignorant that they would treat Him worse than they did the prophets, but because the Son ought to be reverenced by them. But if they should still be rebellious and slay Him, this would crown their iniquity. Lest therefore any should say that the Divine Presence has necessarily been the cause of their disobedience, He uses purposely this doubtful mode of speech.

(in Marc. 12.) Or understanding it morally; to every one of the faithful is let out a vineyard to cultivate, in that the mystery of baptism is entrusted to him to work out. One servant is sent, a second and a third, when the Law, the Psalms, and the Prophets are read. But the servant who is sent is said to be treated despitefully or beaten, when the word heard is despised or blasphemed. The heir who is sent that man kills as far as he can, who by sin tramples under foot the Son of God. (Heb. 6:6.) The wicked husbandman being destroyed, the vineyard is given to another, when with the gift of grace, which the proud man spurned, the humble are enriched.