But especially when you find fault with someone ungrateful or dishonest, you need to look at yourself first. You are clearly at fault if you expected someone with a bad character to be true to you. Or when you did someone a favor, you should have stopped there — satisfied that you had done what you set out to do. You should have thought that the act itself was your full reward. What more do you want? You did a good deed for another person. Isn't that enough?
But then especially, when thou dost find fault with either an unthankful, or a false man, must thou reflect upon thyself. For without all question, thou thyself art much in fault, if either of one that were of such a disposition, thou didst expect that he should be true unto thee: or when unto any thou didst a good turn, thou didst not there bound thy thoughts, as one that had obtained his end; nor didst not think that from the action itself thou hadst received a full reward of the good that thou hadst done. For what wouldst thou have more? Unto him that is a man, thou hast done a good turn: doth not that suffice thee?