conscience
con.science or in conscience \'ka:n-ch*n(t)s\ n [ME, fr. OF, fr. L conscientia, fr. conscient-, consciens, pr]p. of conscire to be conscious, be conscious of guilt, fr. com- + scire to know - more at SCIENCE 1a: the sense or consciousness of the moral goodness or blameworthiness of one's own conduct, intentions, or character together with a feeling of obligation to do right or be good 1b: a faculty, power, or principle enjoining good acts 1c: the part of the superego in psychoanalysis that transmits commands and admonitions to the ego obs 2: CONSCIOUSNESS 3: conformity to the dictates of conscience : CONSCIENTIOUSNESS : in all fairness - in all conscience
Webster's English Dictionary