John Chrysostom — as excerpted in the Catena Aurea on Luke 14:12-14

“Let us not then bestow kindness on others under the hope of return. For this is a cold motive, and hence it is that such a friendship soon vanishes. But if you invite the poor, God, who never forgets, will be your debtor, as it follows, But when ye make a feast, call the poor, the maimed, the lame, and the blind.”