I don't know. 1 Corinthians 6:7 seems to indicate that we should allow ourselves, at least to some degree, to be cheated by at least our beloved Christian brothers and sisters. I couldn't find, "Fool me once..." in the concordance.
Well, of COURSE that's not in your concordance! Per Matthew 18:21-22, the correct number is not once. It's 490. That's 4-9-0. I think a good figurative reading is that 490 = infinity, which is my understanding of the Jewish requirement. But for Christian literalists, once you hit 491 you can still allow yourself to be cheated, but it's optional.
Since the counting back then was in Roman numerals, 490 was for all practical purposes infinity. Seems like I heard some preacher say that was 490 times a day for the same offense, but I've read Exegetical Fallacies, so who knows?
Oops, looks like I got hornswaggled lol.