1. "People's life is limited, but serving the people is infinite. I want to devote my limited life to serving the people infinitely." This sentence expresses Lei Feng's selfless dedication, and he is willing to use his life to help others, which embodies his noble character and lofty spirit.

2. "Treat comrades as warm as spring and work as hot as summer." This sentence reflects Lei Feng's enthusiasm and seriousness towards comrades and work. He regards his comrades as his relatives and is full of enthusiasm and motivation for his work.

3. "In the melting pot of revolution, we should forge screws that don't rust." This sentence emphasizes Lei Feng's screw spirit, that is, the spirit of creating extraordinary achievements in ordinary work based on his own duties. He thinks he is like a screw, small but indispensable, and is willing to contribute his strength to the revolutionary cause.

4. "The most glorious thing in the world is working, and the happiest thing is working for the people." This sentence reveals Lei Feng's love for labor and serving the people. He believes that serving the people through labor is the most glorious and happiest thing.

5. "A drop of water will never dry up unless it is put into the sea. A person can be most powerful only when he integrates himself with the collective." This sentence emphasizes the relationship between the individual and the collective, and thinks that only in the collective can we play our role better. At the same time, it also expressed praise for the unity.

These famous sayings and sentences all reflect the noble quality and lofty spirit of Lei Feng, which is of great significance for inspiring people to be positive and helpful.