Wisdom from Elif Shafak’s, The Forty Rules of Love.

Whatever you speak, good or evil, will somehow come back to you. Therefore, if there is someone who harbours ill thoughts about you, saying similarly bad things about him, will only make matters worse. You will be locked in a vicious circle of malevolent energy. Instead, for forty days and nights, say and think nice things about that person. Everything will be different at the end of 40 days, because you will be different inside.