A wolf coming out of a field of oats met a horse and thusaddressed him: "I would advise you to go into that field. it isfull of fine oats, which I have left untouched for you, as youare a friend whom I would love to hear enjoying good eating." Thehorse replied, "If oats had been the food of wolves, you wouldnever have indulged your ears at the cost of your belly1." 
Men of evil reputation, when they perform a good deed, fail to get credit for it. 