“So that servant came, and shewed his lord these things. Then the master of the house being angry said to his servant, Go out quickly into the streets and lanes of the city, and bring in hither the poor, and the maimed, and the halt, and the blind.”
The servant came back and reported this to his master. Then the owner of the house became angry and ordered his servant, go out quickly into the streets and alleys of the town and bring in the poor, the crippled, the blind and the lame — the owner's anger produces the radical re-invitation: go to the streets and alleys (the public spaces where the homeless and destitute gather) and bring in the poor, crippled, blind, and lame — the same list as Jesus' banquet-invitation instruction to the host (verse 13).
Church Fathers on Luke 14:21
Our Lord had just before taught us to prepare our feasts for those who cannot repay, seeing that we shall have our reward at the resurrection of the just. Some one then, supposing the resurrection of the just to be one and the same with the kingdom of God, commends the above-mentioned recompense; for it follows, When one of them that sat at meat with him heard these things, he said to him, Blessed is he that shall eat bread in the kingdom of God.
That man was carnal, and a careless hearer of the things which Christ delivered, for he thought the reward of the saints was to be bodily.
Or because he sighed for something afar off, and that bread which he desired lay before him. For who is that Bread of the kingdom of God but He who says, I am the living bread which came down from heaven? Open not your mouth, but your heart.