But, we shall be asked, what is there to prove for us the continuity of the soul, of the monad, the spiritual entity through all these existences, since it loses the memory of them in succession? What is there to prove, we shall reply, the identity of your person during waking existence and during sleep? You wake up every morning from a state as strange, as inexplicable as death; you rise from this condition of nothingness to return to it again at night. Was it nothingness? No, for you have been dreaming, and your dreams have been as real to you as the reality of the waking state. A change in the physiological conditions of the brain has modified the relations of soul and body and displaced your psychical point of view. You were the same individual but you found yourself in another environment, and living another existence. In magnetized subjects, somnambulists and clairvoyants, sleep develops new faculties which to us seem miraculous, though they are the natural faculties of the soul when detached from the body. Once aroused, these clairvoyants no longer remember what they have seen, said or done during their lucid sleep, but they remember perfectly well in one sleep what happened in the previous one, and at times predict with mathematical certainty what will happen in the next. They have, then, two consciousnesses as it were, two alternate lives entirely distinct from one another, but each of which has its own rational continuity. They roll themselves round the same individuality like cords of different colours round an invisible thread.