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.
生活的目的不是快乐。它是有用的,是光荣的,是富有同情心的,是让你活得有意义,活得好。
The only limit to our realization of tomorrow will be our doubts of today.