1. Everything we do should be cautious and confident. ——Epictetus 2. Always have confidence in everything and always think about "doing it". If you do something and worry about "I'm afraid I can't do it" first, then you won't have the courage. ——Gai Jingtian 3. In addition to passionate feelings, we must also have quiet research, and in the midst of pain and difficulty, we must also appreciate its fun. ——Qu Qiubai 4. Many people do things with a guilty conscience because of their own weakness, not all of them deliberately betray their trust. ——La Rochefoucauld