Luke 17:4

If he sin against thee seven times in a day, and seven times in a day return, saying, I repent — That is, if he give sufficient proof that he does really repent, after having sinned ever so often, receive him just as if he had never sinned against thee. But this forgiveness is due only to real penitents. In a lower sense we are to forgive all, penitent or impenitent; (so as to bear them the sincerest good will, and to do them all the good we can;) and that not seven times only, but seventy times seven.