1. If we admit failure too readily, we may not realize that we are very close to being right. ---Karl Popper

2. The same is true for "difficulty". Facing a cliff, you won't be able to see a crack in a hundred years, but with an axe, you can get in inch by inch. Step by step, keep accumulating, leaps will come, and breakthroughs will follow. ---Hua Luogeng (China)

3. I have been working hard for more than fifty years and am committed to the development of science. One word can describe the characteristics of my most difficult work, and that word is "failure."

---Thomson

4 Since ancient times, heroes have suffered many hardships

5 Don’t be afraid of difficulties when attacking a city, but don’t be afraid of books if you attack a city

6 In science, you can overcome obstacles and fight hard