Popular medicine deals only with external effects and physical causes, occult science goes deeper, seeking for fundamental causes and final effects, which are of far greater importance than the passing manifestations taking place in the physical form. Thus, for instance, a promiscuous sexual intercourse not only causes venereal diseases; but as during that act a commingling of the inner natures takes place to a certain extent, a man cohabiting with a depraved woman takes on some of her characteristics and joins to a certain extent her future _Karma_ and destiny to his own. The basis of the existence of human beings is what, for want of a better expression, has been called the _Will_ (Spirit or Life), and as one body may colour or poison another, likewise a colouring, and perhaps poisoning, takes place by a blending of spirit during sexual intercourse; this “spiritual substance” being the essence of each human being. “If a woman leaves her husband, she is then not free from him, nor he from her; for a marital union having once been established, remains a union for all eternity.” (“De Homunculis.”) That which nourishes a thing, goes to make up its substance. The physical body receives its nutriment from the physical plane, the soul is nourished by the influences coming from the soul of the world, the intellect is nourished, grows and expands in the intellectual plane; an ill-fed body becomes diseased; a soul living on morbid desires and inordinate longings becomes depraved, a mind fed with false theories, errors and superstitions becomes dwarfed, perverted and unable to turn its face towards the sunlight of truth. The food for soul and mind is as substantial to them as material food is substantial to the material body; body, soul, and spirit being three states of the eternal _One_, manifested on three different planes of existence, being governed by only one fundamental law. What the stomach is in the body, the memory is in the mind. Both are related together; a dyspeptic stomach causes a defective memory and an irritable mind; an irritable temperament causes indigestion and forgetfulness; forgetfulness can cause inattention, irritability and dyspepsia. Soul, body and mind are one in man, and disorders existing in one can cause impurities in the other; each passion in man, each superstition in which he firmly believes, is capable of poisoning his body and of producing a certain disease. A belief in salvation made easy renders a man indolent, indolence causes want of self-control, which causes want of resistance to injurious influences in the physical plane. Repeated physical misfortunes may make a man a coward, and his cowardliness prevents him from letting go of a doctrine which he intuitively known to be false. Anger is not only injurious to bodily health, but drives away reason by confusing the mind; wrath causes not only mental but also physical shortsightedness, and hard-hearing is often the only cause of a suspicious character.