Mencius - Book 2, Part 1, Chapter 6B

'The feeling of commiseration is the principle of benevolence. The feeling of shame and dislike is the principle of righteousness. The feeling of modesty and complaisance is the principle of propriety. The feeling of approving and disapproving is the principle of knowledge.

'Men have these four principles just as they have their four limbs. When men, having these four principles, yet say of themselves that they cannot develop them, they play the thief with themselves, and he who says of his prince that he cannot develop them plays the thief with his prince.

'Since all men have these four principles in themselves, let them know to give them all their development and completion, and the issue will be like that of fire which has begun to burn, or that of a spring which has begun to find vent. Let them have their complete development, and they will suffice to love and protect all within the four seas. Let them be denied that development, and they will not suffice for a man to serve his parents with.'
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.