372. What is the moral conscience?

Moral conscience, present in the heart of the person, is a judgment of reason which at the appropriate moment enjoins him to do good and to avoid evil. Thanks to moral conscience, the human person perceives the moral quality of an act to be done or which has already been done, permitting him to assume responsibility for the act. When attentive to moral conscience, the prudent person can hear the voice of God who speaks to him or her.

Further reading: CCC 1776-1780, 1795-1797


373. What does the dignity of the human person imply for the moral conscience?

The dignity of a human person requires the uprightness of a moral conscience (which is to say that it be in accord with what is just and good according to reason and the law of God). Because of this personal dignity, no one may be forced to act contrary to conscience; nor, within the limits of the common good, be prevented from acting according to it, especially in religious matters.
      

Further reading: CCC 1780-1782, 1798