I Corinthians 14:10 There are, it may be, so many kinds of voices in the world, and none of them is without signification.

Conscience:

The faculty, power, or inward principle which decides as to the character of one's own actions, purposes, and affections, warning against and condemning that which is wrong, and approving and prompting to that which is right; the moral faculty passing judgment on one's self;

 ONLY FOUND IN THE NEW TESTAMENT 

What is Conscience?  Conscience is the voice of the human spirit