From the original text of Zhuangzi's Three Masters of Health Preservation, "My life is limited, but my knowledge is also limited. With restrictions, there is no restriction, and it is almost there! It's almost enough for people who already know! Good has no near name, and evil has no near punishment. The Governor thinks that he can protect himself, support his relatives all his life, and work for many years. "

Life is limited, but knowledge is infinite (without boundaries), and it is doomed to fail to pursue infinite knowledge with limited life. Explain that everything should not be absolute, enough is enough. There will always be things you can't reach, so why be so demanding?