1. If you want to know yourself, you'd better ask others about self-knowledge. -Japan

2. Never think that you know everything at any time. No matter how highly people think of you, you should always have the courage to say to yourself: I am a person who knows nothing. -Pavlov

3. If we know others as well as ourselves, we will feel tolerant of the most reprehensible behavior. -Mo Luoya

4. You know where your shoes are tight. -Spain