Sincerity is a Law of Nature

"Sincerity is a law of nature attributed to us from birth, a sincere person true to his word is one whose soul is a combination of emotions and rationally, uniform in word and deed, a harmonious single entity.  Being true to one's word and keeping one's promises is a form of discipline and self-expectation we must have.  At the same time, it is a wish and expectation society has of us."

-- Buddha