Once you have the master-key, you may unlock many doors of mystery which have heretofore been closed to you. We do not have to fall back on cases of witchcraft, however, in order to illustrate this phase of the use of psychic influence for selfish ends. In Europe and America there are teachers of a low form of occultism who instruct their pupils in the art of producing induced mental states in the minds of others, for purposes of financial gain or other selfish ends. For instance, there is a Western teacher who instructs his pupils to induce desired mental states in prospective customers, or others whom they may wish to influence for selfish reasons. This teacher tells his pupils to: "Imagine your prospective customer, or other person, as seated in a chair before which you are standing. Make the imagined picture as strong as possible, for upon this depends your success. Then proceed to 'treat' this person just as if he were actually present. Concentrate your will upon him, and tell him what you expect to tell him when you meet him. Use all of the arguments that you can think of, and at the same time hold the thought that he must do as you say. Try to imagine him as complying with your wishes in every respect, for this imagining will tend to 'come true' when you really meet the person. This rule may be used, not only in the case of prospective customers, but also in the case of persons whom you wish to influence in any way whatsoever." Surely this is a case of employing psychic powers for selfish purposes, if anything is. Again, in Europe and America, particularly in the latter country, we find many persons who have picked up a smattering of occult knowledge by means of some of the many healing cults and organizations which teach the power of thought over physical diseases. In the instruction along the lines of distant mental healing, the student is taught to visualize the patient as strongly and clearly as possible, and to then proceed to make statements of health and strength. The mind of the patient, and that of the healer, cooperate and in many cases work wonderful cures. As you will see in the last lesson of this course, there is great power in the mind to induce healthful vibrations in the mind of others, and the work is a good and worthy one. But, alas! as is so often the case, the good teaching is sometimes perverted, and applied for unworthy and selfish ends. Some of the persons who have picked up the principles of mental healing have discovered that the same power may be used in a bad as well as in a good direction. They accordingly, proceed to "treat" other persons with the object of persuading them to do things calculated to benefit the person using the psychic power. They seek to get these other persons under their psychic influence, and to then take advantage of them in some way or other.