conscience

noun
  1. The inner sense of what is right or wrong in one's conduct or motives, impelling one toward right action. noun
    His conscience told him to apologize for his mistake.
    She could not ignore the voice of her conscience urging her to help the stranger.
  2. The complex of ethical and moral principles that controls or inhibits the actions or thoughts of an individual. noun
    He wrestled with his conscience before deciding to report the incident.
    Her conscience wouldn't allow her to take credit for someone else's work.
  3. A faculty, power, or principle enjoining good acts. noun
    The decision was made in good conscience.
    He acted according to his conscience, even when it was difficult.