1. Self-criticism is as important to us as sunlight, air, and water. ——Stalin

2. If you know your mistakes and can correct them, there is no greater good.

3. It is never too late to correct a mistake if you know it. ——Shakespeare

4. In the revolutionary cause, recognizing one's shortcomings is equivalent to correcting more than half of them. ——Lenin

5. If you are not prepared for others, you will fail to detect yourself. ——"Shang Shu·Yi Xun"

6. If there is something, correct it, if not, add encouragement. ——Zhu Xi