It is customary for the writers and teachers of Suggestion to explain that it is the "objective or voluntary" mind which make the mental impression, or suggestion, upon the "subjective or involuntary" mind. But they do not describe the process or give us any analogy in nature whereby we may more readily comprehend the idea. But if you will think of the matter in the light of the Hermetic Teachings you will be able to see that the energizing of the Feminine Principle by the Vibratory Energy of the Masculine Principle Is in accordance to the universal laws of nature, and that the natural world affords countless analogies whereby the principle may be understood. In fact, the Hermetic Teachings show that the very creation of the Universe follows the same law, and that in all creative manifestations, upon the planes of the spiritual, the mental, and the physical, there is always in operation this principle of Gender-this manifestation of the Masculine and the Feminine Principles. "As above, so below; as below, so above." And more than this, when the principle of Mental Gender is once grasped and understood, the varied phenomena of psychology at once becomes capable of intelligent classification and study, instead of being very much in the dark. The principle "works out" in practice, because it is based upon the immutable universal laws of life. We shall not enter into an extended discussion of, or description of, the varied phenomena of mental influence or psychic activity. There are many books, many of them quite good, which have been written and published on this subject of late years. The main facts stated in these various books are correct, although the several writers have attempted to explain the phenomena by various pet theories of their own. The student may acquaint himself with these matters, and by using the theory of Mental Gender he will be able to bring order out of the chaos of conflicting theory and teachings, and may, moreover, readily make himself a master of the subject if he be so inclined. The purpose of this work is not to give an extended account of psychic phenomena but rather to give to the student a master-key whereby He may unlock the many doors leading into the parts of the Temple of Knowledge which he may wish to explore. We feel that in this consideration of the teachings of The Kybalion, one may find an explanation which will serve to clear away many perplexing difficulties--a key that will unlock many doors. What is the use of going into detail regarding all of the many features of psychic phenomena and mental science, provided we place in the hands of the student the means whereby he may acquaint himself fully regarding any phase of the subject which may interest him. With the aid of The Kybalion one may go through any occult library anew, the old Light from Egypt illuminating many dark pages, and obscure subjects. That is the purpose of this book. We do not come expounding a new philosophy, but