Forget and leave The most lethal thing for you and me is not poison, but rather it is our thoughts. What takes us toward disappointment is the way we think. If we choose by mistake or do something wrong, we should accept it and then forget it. The key to happiness is hidden in these two words: forget and leave; forget your mistakes and leave the bitterness of the past in the past. To your opinion, won’t our tranquility and happiness be preserved in this way?