In addition to the changing of the poles of one's own mental states by the operation of the art of Polarization, the phenomena of Mental Influence, in its manifold phases, shows us that the principle may be extended so as to embrace the phenomena of the influence of one mind over that of another, of which so much has been written and taught of late years. When it is understood that Mental Induction is possible, that is that mental states may be produced by "induction" from others, then we can readily see how a certain rate of vibration, or polarization of a certain mental state, may be communicated to another person, and his polarity in that class of mental states thus changed. It is along this principle that the results of many of the "mental treatments" are obtained. For instance, a person is "blue," melancholy and full of fear. A mental scientist bringing his own mind up to the desired vibration by his trained will, and thus obtaining the desired polarization in his own case, then produces a similar mental state in the other by induction, the result being that the vibrations are raised and the person polarizes toward the Positive end of the scale instead toward the Negative, and his Fear and other negative emotions are transmuted to Courage and similar positive mental states. A little study will show you that these mental changes are nearly all along the line of Polarization, the change being one of degree rather than of kind. A knowledge of the existence of this great Hermetic Principle will enable the student to better understand his own mental states, and those of other people. He will see that these states are all matters of degree, and seeing thus, he will be able to raise or lower the vibration at will--to change his mental poles, and thus be Master of his mental states, instead of being their servant and slave. And by his knowledge he will be able to aid his fellows intelligently and by the appropriate methods change the polarity when the same is desirable. We advise all students to familiarize themselves with this Principle of Polarity, for a correct understanding of the same will throw light on many difficult subjects. CHAPTER XI RHYTHM "Everything flows out and in; everything has its tides; all things rise and fall; the pendulum-swing manifests in everything; the measure of the swing to the right, is the measure of the swing to the left; rhythm compensates"--The Kybalion.