Luke 14:17

That servant who was sent is Christ Himself, who being by nature God and the true Son of God, emptied Himself, and took upon Him the form of a servant. But He was sent at supper time. For not in the beginning did the Word take upon Him our nature, but in the last time; and he adds, For all things are ready. For the Father prepared in Christ the good things bestowed upon the world through Him, the removal of sins, the participation of the Holy Spirit, the glory of adoption. To these Christ bade men by the teaching of the Gospel.

By this servant then who is sent by the master of the family to bid to supper, the order of preachers is signified. But it is often the case that a powerful person has a despised servant, and when his Lord orders any thing through him, the servant speaking is not despised, because respect for the master who sends him is still kept up in the heart. Our Lord then offers what he ought to be asked for, not ask others to receive. He wishes to give what could scarcely be hoped for; yet all begin at once to make excuse, for it follows, And they all began with one consent to make excuse. Behold a rich man invites, and the poor hasten to come. We are invited to the banquet of God, and we make excuse.

(ubi sup.) Or else, the Man is the Mediator between God and man, Christ Jesus; He sent that they who were bidden might come, i. e. those who were called by the prophets whom He had sent; who in the former times invited to the supper of Christ, were often sent to the people of Israel, often bade them to come at supper time. They received the inviters, refused the supper. They received the prophets and killed Christ, and thus ignorantly prepared for us the supper. The supper being now ready, i. e. Christ being sacrificed, the Apostles were sent to those, to whom prophets had been sent before.