The only way to have peace is for the heart to be yielded to the truth and in one accord with the mind. The struggle we all feel in life is the heart struggling against our mind concerning the truth. All the trouble we know in this life is felt in our mind as it constantly tries to some way reconcile good with all the evil around us. This is what we inherited from our ancestors - the knowledge of good and evil. We CAN live with a good conscience and peace of mind only by having a heart that is yielded to God and his truth. Intellectual knowledge is not enough to deliver a soul from death, for "with the heart man believeth unto righteousness." The new birth happens when the heart yields to God, and not before.