In concentration lies the secret of all things. What is meant by concentration is the change of identification of the soul, so that it may lose the false conception of identification and identify itself with the true self instead of the false self. This is what is meant by self-realization. Once a person realizes his self by the proper way of concentration, of contemplation, of meditation, he has understood the essence of all religions. Because all religions are only different ways that lead to one truth, and that truth is self-realization.