The imagination becomes strong through the will and the will becomes powerful through imagination. Either of these two is the life of the other, and if they become one and identical, they constitute a living spirit to which nothing inferior offers resistance. In the ignorant and doubtful, in those who do not know their own mind and doubt the result of success, consequently in the majority of experiments carried on for the purpose of gratifying a scientific curiosity or for some other selfish purpose, the will and imagination are not one, but act in two different directions. If we look with one eye to heaven and with the other to the earth, or with one to the restoration of the patient’s health and with the other to the profits knowledge or renown we may receive from it ourselves, there is no unity of motive or purpose, and consequently a lack of the principal condition for success. A physician desirous of employing such means should therefore be of such a nobility of character as to be above all selfish considerations, and only intent upon doing his duty according to the commands of divine love. Only that which comes from the heart goes to the heart; the power that comes from the brain alone has no magic effects unless it becomes united with that which comes from the heart. It resembles the cold and ineffective moonlight, but it becomes a strong power by its union with the sunshine that radiates from the centre of the heart. “Thus the imagination becomes a spirit, and its vehicle is the body, and in this body are generated the seeds which bear good and evil fruits.” (“De virtute imaginativa,” III.) IV.—SPIRITUALES. Up to this class we have had to deal with forces which are, even if not fully recognized, at least admitted by modern science; but now we are going to speak of the action of a spiritual power, which, being in the conscious possession of only a few persons, is almost entirely unknown. This is the power which the self-conscious spirit exercises over the unintelligent forces in nature, and which comes under the head of “Magic,” a term whose meaning is understood only by few. “Magic”—from _mag_, priest—means the great power of wisdom, an attribute of the self-conscious spirit, holy or devilish according to the purpose to which it is applied. It is therefore a power which does not belong to the terrestrial intellectual man; but to the spiritual man, and it may even be exercised by the latter without the external man being aware of the source of this power acting in him. For this reason we often see that some remedy proves very efficacious in the hands of one physician and entirely useless in the hands of another equally learned and intellectual. Paracelsus says: