1. The most valuable thing in life is life. Life belongs to people only once. A person's life should be spent like this: when he looks back on the past, he will not regret for wasting his years, nor will he feel shame for doing nothing. (Ostrovsky)

2. Although the road of life is long, there are only a few critical steps, especially when a person is young. (Liu Qing)

3. If there is a will, things will come true. If the cauldron sinks the boat, a hundred and two Qin passes will eventually belong to Chu; if a person works hard, God will not let him down; if he sleeps on his salary and tastes courage, three thousand Yuejia can swallow Wu. (Pu Songling, Qing Dynasty)

4. When you are old and strong, you would rather move your heart with a white head; when you are poor and strong, you will not fall into the clouds. (Wang Bo of Tang Dynasty)

5. Aim high and high (Zhuge Liang) 6. The most important thing for a bird is its wings, and the most important thing for a man is his ideal. (Proverb)

1. The Swedish chemist Nobel was determined to invent explosives in order to reduce the heavy labor of workers digging soil. For four whole years, he did hundreds of experiments without sacrificing himself. It was inspired by a lofty goal that produced amazing perseverance and selfless lofty spirit, and invented dynamite.

2. Xu Xiake, a famous geographer in the Ming Dynasty, set his ambition to "explore the wonders of famous mountains and rivers" when he was young. Later, he was in danger many times and almost died, but he was never afraid, and finally left people with "Xu Xiake's Travels", which has great academic value.

3. When Zhou Enlai was in elementary school, he asked the principal why he studied: to study for the rise of China.

4. Li Shizhen in the Ming Dynasty found many errors in previous medicine books and determined to write a medicine book. After traveling thousands of miles and spending more than thirty years, he finally wrote the epoch-making medical masterpiece - "Compendium of Materia Medica".