The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
The best lies are the ones we tell ourselves.
做事情,不能有伤害别人的坏念头;但要有警惕他人、防备他人的念头。这是在告诫与人交往思考不周的人。