Everyone seems to have a clear idea of how other people should lead their lives, but none about his or her own.
出自先秦《荀子·儒效》。对于所知道的东西就说知道,不知道的就说不知道;这样,对内是不欺骗自己的良心,对外是不欺骗他人。说明为人应当诚实的道理。
All things excellent are as difficult as they are rare.
The true test of a mathematical idea is its ability to inspire further questions.