The famous sayings about speculation are as follows:

1. Thinking is the greatest pleasure of mankind. ——Brecht

2. True knowledge and insights first come from thinking and doubting. ——Rockwell

3. Thinking makes what we read become our own. ——Locke

4. Intelligence cancels fate. As long as he can think, he is autonomous. ——Emerson

5. People should believe that things they don’t understand can always be understood, otherwise they will not think about it anymore. ——Goethe

6. Learning without thinking will lead to confusion. ——Confucius

7. Spending time on thinking is the most time-saving thing. ——Cousins

8. Thinking is the greatest pleasure of mankind. ——Brecht

9. Hypocrisy likes to hide in the noblest thinking. It never tries to break away from thinking, because thinking can give it a noble reputation without any effort. ——Edmund Burke

10. The objective world is just a primitive spiritual poem without consciousness; the general tool of philosophy and the keystone of the entire building is the philosophy of art. ——Xie Lin

11. The ability to think independently is an essential talent for scientific research and creation of inventions. Any of the more important scientific creations and inventions in history are inseparable from the creator's independent and in-depth approach to looking at problems. ——Hua Luogeng

12. Thinking makes what we read become our own. ——Locke

13. The development of the thinking world, in a sense, is the continuous getting rid of surprise. ——Einstein

14. If no one provides us with lessons from failure, we will achieve nothing. The trajectory of our thinking is to choose between right and wrong, and the frequency of wrong choices is equal to that of right choices. ——Lewis Thomas

15. There are two things. The more deeply and persistently we think about them, the greater and greater wonder and awe they evoke will fill our hearts. , this is the starry sky and the moral law in my heart.

——Kant