1. If it is a mountain, it has height and slope; if it is a river, it will have width and depth; if it is a human being, it will have shortcomings and mistakes.

2. The greatest happiness in the world is to have both love and innocence. ——Rousseau

3. Always expand yourself and the world outside you with a positive and optimistic attitude. ——Zeng Xianzi

4. Noble happiness. Instead of pursuing all kinds of happiness, we should only pursue noble happiness. ——Democritus

5. Pessimists only see problems behind opportunities, while optimists see opportunities behind problems. (Denis Waltley Whitney)

6. No matter what, I will always smile for you, because you like the way I smile.

7. Don’t frown even if you are unhappy, because you never know who will fall in love with your smile.

8. Happiness does not lie in things. Happiness does not lie in things, but in ourselves. ——Richard Wagner

9. The shortening of life span is directly proportional to the wastage of thoughts. ——Darwin

10. When the wind blows and the waves start, you only need to smile and don’t worry. ——Yang Wanli

11. Happiness does not lie in things. Happiness does not lie in things, but in ourselves. ——Richard Wagner

12. Optimists always imagine themselves achieving their goals. ——Seniga

13. Struggle for joy. We have fought for joy, and we will die for joy. Therefore, sorrow should never be associated with our names. ---Fuchik

14. In life, one should strive to make it beautiful. ——Tolstoy’s classic quotations

15. When life gives you a hundred reasons to cry, give it a thousand reasons to smile.

16. Youth is an ordinary name. It is happy and beautiful, but it is also full of hard training. ——Gorky

17. People who are interested in research are happy. People who can free their minds from delusions and free themselves from vanity through research are happier. ——La Metelli

18. The gap between ideal and reality is still too big, but everyone can think better of things and make their life more brilliant.

19. Go your own way and let others tell you! ——Dante

20. Optimism itself is a kind of success