"Tzu-kung asked, Is there a single word which can be a guide to conduct throughout one's life? The Master said, It is perhaps the word shu [reciprocity]. What you don't want yourself, don't do to others."
"To cultivate oneself so as to give all people security and peace, even Yao and Shun found it difficult to do."
"Tsze-kung said, What I do not wish men to do to me, I also wish not to do to men. The Master said, Tsze, you have not attained to that."