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A Textbook of Theosophy by C W Leadbeater

V THE CONSTITUTION OF MAN

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Each thought-form is a temporary entity. It resembles a charged battery, awaiting an opportunity to discharge itself. Its tendency is always to reproduce its own rate of vibration in the mental body upon which it fastens itself, and so to arouse in it a like thought. If the person at whom it is aimed happens to be busy or already engaged in some definite train of thought, the particles of his mental body are already swinging at a certain determinate rate, and cannot for the moment be affected from without. In that case the thought-form bides its time, hanging about its object until he is sufficiently at rest to permit its entrance; then it discharges itself upon him, and in the act ceases to exist.

The self-centred thought behaves in exactly the same way with regard to its generator, and discharges itself upon him when opportunity offers. If it be an evil thought, he generally regards it as the suggestion of a tempting demon, whereas in truth he tempts himself. Usually each definite thought creates a new thought-form; but if a thought-form of the same nature is already hovering round the thinker, under certain circumstances a new thought on the same subject, instead of creating a new form, coalesces with and strengthens, the old one, so that by long brooding over the same subject a man may sometimes create a thought-form of tremendous power. If the thought be a wicked one, such a thought-form may become a veritable evil influence, lasting perhaps for many years, and having for a time all the appearance and powers of a real living entity.

All these which have been described are the ordinary unpremeditated thoughts of man. A man can make a thought-form intentionally, and aim it at another with the object of helping him. This is one of the lines of activity adopted by those who desire to serve humanity. A steady stream of powerful thought directed intelligently upon another person may be of the greatest assistance to him. A strong thought-form may be a real guardian angel, and protect its object from impurity, from irritability or from fear.

An interesting branch of the subject is the study of the various shapes and colours taken by thought-forms of different kinds. The colours indicate the nature of the thought, and are in agreement with those which we have already described as existing in the bodies. The shapes are of infinite variety, but are often in some way typical of the kind of thought which they express.

Every thought of definite character, such as a thought of affection or hatred, of devotion or suspicion, of anger or fear, of pride or jealousy, not only creates a form but also radiates an undulation. The fact that, each one of these thoughts is expressed by a certain colour indicates that the thought expresses itself as an oscillation of the matter of a certain part of the mental body. This rate of oscillation communicates itself to the surrounding mental matter precisely in the same way as the vibration of a bell communicates itself to the surrounding air.

This radiation travels out in all directions, and whenever it impinges upon another mental body in a passive or receptive condition it communicates to it something of its own vibration. This does not convey a definite complete idea, as does the thought-form, but it tends to produce a thought of the same character as itself. For example, if the thought be devotional its undulations will excite devotion, but the object of the worship may be different in the case of each person upon whose mental body they impinge. The thought-form, on the other hand, can reach only one person, but will convey to that person (if receptive) not only a general devotional feeling, but also a precise image of the Being for whom the adoration was originally felt.