Professor Yu Dan said that a person's life is only a period of time borrowed from time. Over time, we carved our life into a shape, which became our immortality and our epitaph. After reading Professor Yu Dan's lecture, I realized that it is a kind of wisdom, a kind of wisdom to treat one's own gains and losses correctly, a kind of wisdom to treat friends around him rationally, a kind of morality to integrate into life, and a road of self-improvement and self-happiness. At the same time, we must learn tolerance, which is the deepest virtue in the world. Forgive yourself, learn to give up, and face the world calmly, which can resolve many regrets in your heart. Forgiving others requires a fearless heart. At this time, you will find yourself full of sincerity, enthusiasm and trust. It is said that half of the Analects of Confucius rules the world, but as long as we find what we want from it, we can enjoy it for life.