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 can't 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 really want to invent a feature or machine with such terrible large-scale destructive power that war will become impossible forever. ---Nobel (Sweden)

4. Only by obeying nature can we control nature. ---Bacon (UK)

5. The ocean of truth lets all things undiscovered lie before my eyes for me to explore. ---Newton (UK)

6. The benefits of error are temporary, while the benefits of truth are permanent; when truth has disadvantages, these disadvantages will be eliminated soon, while the disadvantages of fallacy will Always with the fallacy. --- Diderot (France)

7. Anyone who takes the truth lightly in small matters is also untrustworthy in big matters.

---Einstein (USA)