John Lightfoot on Matthew 18:21

[Shall I forgive him? till seven times?] This question of Peter respects the words of our Saviour, verse 15. "How far shall I forgive my brother before I proceed to the extremity? What! seven times?" He thought that he had measured out, by these words, a large charity, being, in a manner, double to that which was prescribed by the schools: "He that is wronged (say they) is forbidden to be difficult to pardon; for that is not the manner of the seed of Israel. But when the offender implores him once and again, and it appears he repents of his deed, let him pardon him: and whosoever is most ready to pardon is most praiseworthy." It is well; but there lies a snake under it; "For (say they) they pardon a man once, that sins against another; secondly, they pardon him; thirdly, they pardon him; fourthly, they do not pardon him," &c.