conscience

noun3

1. •
   a person's own sense of good and bad, which judges what they themselves do

   • Your conscience is your highest authority.
2. •
   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.
3. •
   (no longer used) Consciousness; thinking; awareness, especially self-awareness.

   • Thus conscience does make cowards of us all; And thus the native hue of resolution Is sicklied o'er with the pale cast of thought. — 1599