Conscience

"They're certainly entitled to think that, and they're entitled to full respect for their opinions, but before I can live with other folks I've got to live with myself. The one thing that doesn't abide by majority rule is a person's conscience."- Atticus Finch, To Kill A Mockingbird
Amazon.com: To Kill a Mockingbird

"For there is no respect of persons with God...For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: which shew the work of the law written in their hearts, their conscience also being witness, and their thoughts the mean while accusing or else excusing one another:" (Romans 2:11, 14-15).