A Textbook of Theosophy

by C. W. Leadbeater

The causal body is the permanent vehicle of the ego in the higher mental world. It consists of matter of the first, second and third subdivisions of that world. In ordinary people it is not yet fully active, only that matter which belongs to the third subdivision being vivified. As the ego unfolds his latent possibilities through the long course of his evolution, the higher matter is gradually brought into action, but it is only in the perfected man whom we call the Adept that it is developed to its fullest extent. Such matter can be discerned by clairvoyant sight, but only by a seer who knows how to use the sight of the ego.

It is difficult to describe a causal body fully, because the senses belonging to its world are altogether different from and higher than ours at this level. Such memory of the appearance of a causal body as it is possible for a clairvoyant to bring into his physical brain represents it as ovoid, and as surrounding the physical body of the man, extending to a distance of about eighteen inches from the normal surface of that body. In the case of primitive man it resembles a bubble, and gives the impression of being empty. It is in reality filled with higher mental matter, but as this is not yet brought into activity it remains colourless and transparent. As advancement continues it is gradually stirred into alertness by vibrations which reach it from the lower bodies. This comes but slowly, because the activities of man in the earlier stages of his evolution are not of a character to obtain expression in matter so fine as that of the higher mental body; but when a man reaches the stage where he is capable either of abstract thought or of unselfish emotion the matter of the causal body is aroused into response.

When these rates of undulation are awakened within him they show themselves in his causal body as colours, so that instead of being a mere transparent bubble it gradually becomes a sphere filled with matter of the most lovely and delicate hues—an object beautiful beyond all conception. It is found by experience that these colours are significant. The vibration which denotes the power of unselfish affection shows itself as a pale rose-colour; that which indicates high intellectual power is yellow; that which expresses sympathy is green, while blue betokens devotional feeling, and a luminous lilac-blue typifies the higher spirituality. The same scheme of colour-significance applies to the bodies which are built of denser matter, but as we approach the physical world the hues are in every case by comparison grosser—not only less delicate but also less living.

In the course of evolution in the lower worlds man often introduces into his vehicles qualities which are undesirable and entirely inappropriate for his life as an ego—such, for example, as pride, irritability, sensuality. These, like the rest, are reducible to vibrations, but they are in all cases vibrations of the lower subdivisions of their respective worlds, and therefore they cannot reproduce themselves in the causal body, which is built exclusively of the matter of the three higher subdivisions of its world. For each section of the astral body acts strongly upon the corresponding section of the mental body, but only upon the corresponding section; it cannot influence any other part. So the causal body can be affected only by the three higher portions of the astral body; and the oscillations of those represent only good qualities.

The practical effect of this is that the man can build into the ego (that is, into his true self) nothing but good qualities; the evil qualities which he develops are in their nature transitory and must be thrown aside as he advances, because he has no longer within him matter which can express them. The difference between the causal bodies of the savage and the saint is that the first is empty and colourless, while the second is full of brilliant, coruscating tints. As the man passes beyond even saint-hood and becomes a great spiritual power, his causal body increases in size, because it has so much more to express, and it also begins to pour out from itself in all directions powerful rays of living light. In one who has attained Adeptship this body is of enormous dimensions.

The mental body is built of matter of the four lower subdivisions of the mental world, and expresses the concrete thoughts of the man. Here also we find the same colour-scheme as in the causal body. The hues are somewhat less delicate, and we notice one or two additions. For example, a thought of pride shows itself as orange, while irritability is manifested by a brilliant scarlet. We may see here sometimes the bright brown of avarice, the grey-brown of selfishness, and the grey-green of deceit. Here also we perceive the possibility of a mixture of colours; the affection, the intellect, the devotion may be tinged by selfishness, and in that case their distinctive colours are mingled with the brown of selfishness, and so we have an impure and muddy appearance. Although its particles are always in intensely rapid motion among themselves, this body has at the same time a kind of loose organization.

The size and shape of the mental body are determined by those of the causal vehicle. There are in it certain striations which divide it more or less irregularly into segments, each of these corresponding to a certain department of the physical brain, so that every type of thought should function through its duly assigned portion. The mental body is as yet so imperfectly developed in ordinary men that there are many in whom a great number of special departments are not yet in activity, and any attempt at thought belonging to those departments has to travel round through some inappropriate channel which happens to be fully open. The result is that thought on those subjects is for those people clumsy and uncomprehending. This is why some people have a head for mathematics and others are unable to add correctly—why some people instinctively understand, appreciate and enjoy music, while others do not know one tune from another.

All the matter of the mental body should be circulating freely, but sometimes a man allows his thought upon a certain subject to set and solidify, and then the circulation is impeded, and there is a congestion which presently hardens into a kind of wart on the mental body. Such a wart appears to us down here as a prejudice; and until it is absorbed and free circulation restored, it is impossible for the man to think truly or to see clearly with regard to that particular department of his mind, as the congestion checks the free passage of undulations both outward and inward.

When a man uses any part of his mental body it not only vibrates for the time more rapidly, but it also temporarily swells out and increases in size. If there is prolonged thought upon a subject this increase becomes permanent, and it is thus open to any man to increase the size of his mental body either along desirable or undesirable lines.

Good thoughts produce vibrations of the finer matter of the body, which by its specific gravity tends to float in the upper part of the ovoid; whereas bad thoughts, such as selfishness and avarice, are always oscillations of the grosser matter, which tends to gravitate towards the lower part of the ovoid. Consequently the ordinary man, who yields himself not infrequently to selfish thoughts of various kinds, usually expands the lower part of his mental body, and presents roughly the appearance of an egg with its larger end downwards. The man who has repressed those lower thoughts, and devoted himself to higher ones, tends to expand the upper part of his mental body, and therefore presents the appearance of an egg standing on its smaller end. From a study of the colours and striations of a man's mental body the clairvoyant can perceive his character and the progress he has made in his present life. From similar features of the causal body he can see what progress the ego has made since its original formation, when the man left the animal kingdom.