1. A person who has a shallow understanding of human nature and does not change his temperament but changes everything else in order to be happy will not only waste his life with no gain, but will often increase the distress he originally intended to eliminate. 1[UK] Colton

2. Smart people don’t pay attention to things they can’t get, and they don’t worry about them. 1 [English] Hubbert

3. Hope is like a family. Without it, you will feel that life is boring. With it, you will feel that working hard for it every day is a worry. -[US] Mark Twain: "The Collected Works of Mark Twain"

4. Don't take pleasure in someone else's misfortune; don't feel depressed when you see someone happy. 1 [English] Pope

5. Parents should be good at hiding all their happiness, worries and fears in front of their children. 1[English] Bacon: "On the Family"