Theophylact of Ohrid

Do you see what the suppers of Christ are like, how they are turned to the profit of souls and not to the stuffing of the belly? For look, He healed the man suffering from dropsy, He taught the Pharisees that doing good on the Sabbath is a good deed. Then, when He saw that they were making a commotion over sitting in the front seats, He heals this passion too, one arising not from a small cause but from a great and hard-to-avoid one, namely vainglory. …

Commentary on Luke ↗

Ambrose of Milan

First the dropsical man is cured, in whom the abundant discharges of the flesh crushed down the powers of the soul, quenched the ardour of the Spirit. Next, humility is taught, when at the nuptial feast the desire of the highest place is forbidden. As it is said, And he spake, Sit not down in the highest room.

Catena Aurea by Aquinas ↗

Bede

He also spoke a parable to those who were invited, noting how they chose the best places, saying to them, "When you are invited to a wedding, do not sit in the first place." Indeed, this admonition of the Savior is plain on the surface, teaching humility, which is praiseworthy not only before God but also among men, but since the evangelist does not call this a parable in vain, we must briefly consider what it also signifies mystically. In many passages, it appears that Christ and the Church's union are called a wedding. …

On the Gospel of Luke ↗

Bonaventure

He spoke also to those who were invited, etc. After he confuted the observers, here secondly he instructs the guests. This part is divided into three according to a threefold instruction. For first he instructs those invited to the nuptial banquet. Second he instructs those inviting to the familiar banquet, there: He said also to him who had invited him. Third he instructs those to be imitated regarding the eternal banquet, there: A certain man made a great supper, etc. …

Commentary on Luke, Chapter 14 ↗