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