Then Jesus said to his host, "When you give a luncheon or dinner, do not invite your friends, your brothers or sisters, your relatives, or your rich neighbors; if you do, they may invite you back and so you will be repaid. But when you give a banquet, invite the poor, the crippled, the lame, the blind, and you will be blessed. Although they cannot repay you, you will be repaid at the resurrection of the righteous."
We should not do nice things for people with an underlying hope or expectation we will be repaid. Hospitality is tough in today's culture, though- especially the kind of hospitality Jesus is describing. The group he was asking be included would probably include anyone who would have no means of repaying. So, it comes down to being generous and making the effort to do good for those who may be suffering in any way, and expecting nothing in return.
Holy Lord, showing hospitality to strangers is risky and scary in today's world. Help me see opportunities to show hospitality to others, regardless of their ability to repay or even say thank-you. I will be doing this for you, Lord, and not for myself. Amen