text: Let us therefore avoid being ungrateful, not for the sake of others but for our own sakes. When we do wrong, only the least and lightest portion of it flows back upon our neighbour; the worst and, if I may use the term, the densest portion of it stays at home and troubles the owner. My master Attalus used to say: "Evil herself drinks the largest portion of her own poison." The poison which serpents carry for the destruction of others, and secrete without harm to themselves, is not like this poison; for this sort is ruinous to the possessor. The ungrateful man tortures and torments himself; he hates the gifts which he has accepted, because he must make a return for them, and he tries to belittle their value, but he really enlarges and exaggerates the injuries which he has received. And what is more wretched than a man who forgets his benefits and clings to his injuries?