The end of the Good Samaritan story goes that, “The expert in the law replied, “The one who had mercy on him.” Jesus told him, “Go and do likewise.”” (Luke 10:37)
The Samaritan wasn’t accepted by the Jews – they were considered unclean. And yet, in the face of rejection, the Samaritan forgives the prejudice against his people, he sacrifices his comfort (riding on his own donkey), he sacrifices his own sustenance (wine for hydration (wine was used to cover the taste of bad water, not get drunk)), he offers his own money without seeking reimbursement, and the Samaritan came back to check on the man to see if he was in good health and to pay any unpaid debt.
Mercy is not deserved, and it’s not something that is expected to be paid back. Showing mercy to another person is to show the heart of God.