conscience -
A personification of the moral sense of right and wrong, usually in the form of a person, a being or merely a voice that gives moral lessons and advices.
Conscience is an aptitude, faculty, intuition, or judgment of the intellect that distinguishes right from wrong. Moral evaluations of this type may reference values or norms (principles and rules). In psychological terms conscience is often described as leading to feelings of remorse when a human does things that go against his/her moral values, and to feelings of rectitude or integrity when actions conform to such norms.