Conscience is an aptitude, faculty, intuition or judgment of the intellect that distinguishes right from wrong. In psychological terms conscience is often described as leading to feelings of remorse when a human commits actions that go against his/her moral values and to feelings of righteousness or integrity when actions conform to such norms. Religious views of conscience usually see it as linked to a morality inherent in all humans. Conscience is also referreed to as the "voice within" and the "inner light".

Relationship between peace of conscience and peace of mind.

In modern times, there is so much of pain and suffering throughout the world that could be avoided by understanding and applying truth. For many, relief and happiness can come by understanding the relationship between peace of conscience and peace of mind and by living the principles upon which both of these blessings are founded.

Without peace of conscience, you can have no real peace of mind. Peace of conscience relates to your inner self and is controlled by what you personally do. Peace of mind is often affected by external forces such as time-bound or economic pressures, offenses, deteriorating world conditions, or more to do than sufficient time to do it. An unsettled mind is temporary, transitory. Peace of mind is restored by resolving the external forces that disturb it. Peace of conscience cannot be easily restored even if you repent for the past mistakes. A troubled conscience is unrelenting, ever present, a constant reminder from one's mistakes. Peace of conscience can never be achieved by accumulating wrong actions done against our conscience.  

So take an oath right away to follow our conscience for true inner peace. If everyone's action follows his or her conscience, the road to a peaceful life will be much easier since a true conscience can guide our actions to focus on the external forces affecting our peace and find a resolution to the benefit of a bigger section of people.

Some more quotes on conscience which I felt were very thought provoking are reproduced below

The torture of a bad conscience is the hell of a living soul.-JOHN CALVIN

I think we all have a little voice inside us that will guide us. It may be God, I don't know. But I think that if we shut out all the noise and clutter from our lives and listen to that voice, it will tell us the right thing to do. - CHRISTOPHER REEVE

While conscience is our friend, all is at peace however once it is offended, farewell to a tranquil mind - LADY MARY WORTLEY MONTAGU

Never do anything against conscience even if the state demands it.- Albert Einstein

Conscience is God present in man. - Victor Hugo

There is no witness so terrible and no accuser so powerful as conscience which dwells within us - Sophocles

Justice is a temporary thing that must at last come to an end but the conscience is eternal and will never die – Martin Luther

Conscience is a mother-in-law whose visit never ends. - H. L. Mencken