Conscience is not only a record of one's experiences and impressions gained in life, but it is a living voice of the heart which makes all that is in the heart, so to speak, dance in the light of justice. Therefore conscience is a world in man, a world as living as the world in which we live; and even more living than this, for the world of conscience is durable, whereas the outer world is subject to destruction. The word "hiding" or "covering" of a certain thing is for our limited understanding. In point of fact nothing can be covered, nothing can be hidden, since the nature of life is action and reaction. Every outer experience has a reaction within, every inner experience has its reaction in the outside of the life. In the Qur'an it is said, "Their hands and feet will give evidence of their action." The idea, from the point of view of metaphysics, may be thus explained, that there is no action which has not a reaction; every outer action has a reaction inwardly and every inner action has a reaction outwardly.