In the preceding lessons I have shown you how by induction we tend to arouse in others mental and emotional states similar to our own. But there is a law in effect here, which must be noted if you wish to thoroughly understand this phase of psychic influences. Omitting all technical explanations, and getting right down to the heart of the phenomenon, I would say that the general principle is this: Psychic induction is difficult in proportion to the opposing quality of the characteristic mental and emotional states of the person affected; and easy in proportion to the harmonious quality thereof. That is to say, in plain words, that if a person's habitual thought and emotions are along the same lines that you are trying to induce in him, you will find it easy to induce the same in him; if, on the contrary, they are of an opposing nature, then you will find it difficult to so influence him. The many degrees of agreement and difference in the psychic vibrations of persons constitute a scale of comparative response to any particular form of mental or emotional vibrations. It is hard to change the spots of a leopard, or the skin of an Ethiopian, as we are told on ancient authority. It is almost as difficult to change the characteristic mental and emotional states of a person by psychic induction, except after long and repeated efforts. On the contrary, let a person have certain characteristic mental and emotional habits, then these may be aroused in them with the greatest ease by means of psychic induction. For instance, if a person is characteristically and habitually peaceful, mild and calm, it will be very difficult to arouse in him by psychic induction the vibrations of anger, fight and excitement. On the other hand, if the other person is combative, fierce and easily excited to wrath, it is the easiest possible thing to arouse these feelings in him by psychic induction. So much for ordinary psychic induction; let us now consider indirect psychic induction, in which the same principle operates. In indirect psychic induction, that is to say in cases in which psychic vibrations are aroused by induction without deliberate attempt or design to influence any particular person or persons, there is noted the manifestation of a peculiar law of attraction and repulsion along psychic lines. This psychic law operates in the direction of attracting to oneself other persons who, actively or passively, vibrate on the same note, or on some note or notes in general harmony therewith. In the same, way, the law causes you to repel other persons who vibrate on a note or notes in general inharmony or discord to yourself. So, in short, we go through life attracting or repelling, psychically, others in harmonious or inharmonious psychic relation to us, respectively. An understanding of this law and its workings will throw light upon many things in your life which you have not understood previously.