What are some famous quotes about selfless dedication

1. Lu Xun: "What the cow eats is grass and what it squeezes out is milk."

2. Fan Zhongyan: "Be worried about the worries of the world first, and be happy after the joys of the world"

3. "Zuo Zhuan": "With a cold eyebrow, he points at a thousand people, but he bows his head and is willing to be a Ruzi Niu"

4. Lei Feng: "Treat other people's difficulties as your own difficulties, and regard your comrades' happiness as your own happiness."