What is it that brings about death? Either the body, owing to weakness, is not capable of serving the soul properly; or the soul has finished its mission on that plane and does not want the body any more. The body clings to the soul and the soul holds the body; that is the position. When the body is too feeble, it naturally loses its grip on the soul, and generally it loses it more and more till it can no longer hold the soul. Or the soul holds the body as long as it has to accomplish something; and when the soul sees no further purpose then it loses its hold upon the body, and so gradually the body drops out of the hands of the soul.