noun
conscience
KAHN-shuns/ˈkɑːnʃəns/
An inner sense of right and wrong.
Her conscience tells her to return the money she finds.

Etymology
The pieces suggest shared or thorough knowledge. The moral sense perhaps developed from knowing right and wrong along with others to recognizing it within oneself.
In context
he knows what a conscience is he didn't need an arc taking up the entirety of a movie learning to comprehend wrong and right
More examples
- I can't lie about this in good conscience.
- A guilty conscience keeps him awake after he cheats.
- Their consciences won't let them ignore someone in need.
Forms
conscience · consciences
conscientious adjective — Guided by a strong sense of duty.