From observation, we see that the evil we wish upon others always comes back to us; it’s like throwing a stone upward: it falls on us. That is why the teaching, “Do not do to others what you would not want done to yourself” (Tob 4:15; Jesus puts it in favorable terms: Mt 7:12; Lk 6:31), is correct, and it is also wrong to rejoice in others’ misfortune, for tomorrow we may be the ones who suffer the same fate.