1. If the will wants to have the power of law, it must be controlled by reason when reason issues orders. Aquinas

2. When our comrades are in difficulties, we must see the achievements, see the light, and improve our courage. Mao Zedong

3. Exploiting the mineral deposits of human intelligence is indispensable and must be promoted by adversity. Pressure is needed to make gunpowder ignite. Alexandre Dumas

4. No matter how fragile a person is, as long as he devotes all his energy to his goal, he will be able to achieve something. Cicero

5. I am willing to temper my faith in the most difficult places; for believing in ordinary and visible objects is not faith, but only advice. Brown

6. As for me, I was born to work for the public benefit and have never wanted to show my merits. My only consolation is that I hope to see a drop of my own honey in our hive. Krylov

7. As long as there is a kind of infinite self-confidence that fills the heart, and then relies on a strong will and independent and uninhibited intelligence, one day you will succeed. Maupassant

8. You must cheer up when you are a human being. Don't be a little depressed. There will be times in life when things go wrong. The more dissatisfied you are, the more you can cheer up, and it will not be difficult to rise up to defeat heaven. Zhang Yuanji

9. Don’t be discouraged or despair. Be optimistic about everything. Determination is the most important thing. With determination, all difficult things will become easier. Gogol

10. Nothing is difficult in the world, as long as there are people who are willing. Yuan Mu