It is well for every one to know something of "Hatha Yoga," in order that the body may be purified, strengthened, and kept in health in order to become a more fitting instrument of the Higher Self. It is well that each one should know something of "Raja Yoga," that he may understand the training and control of the mind, and the use of the Will. It is well that every one should learn the wisdom of "Gnani Yoga," that he may realize the wonderful truths underlying life--the science of Being. And, most assuredly every one should know something of Bhakti Yogi, that he may understand the great teachings regarding the Love underlying all life. We have written a work on "Hatha Yoga," and a course on "Raja Yoga" which is now in book form. We have told you something regarding "Gnani Yoga" in our Fourteen Lessons, and also in our Advanced Course. We have written something regarding "Bhakti Yoga" in our Advanced Course, and, we hope, have taught it also all through our other lessons, for we fail to see how one can teach or study any of the branches of Yoga without being filled with a sense of Love and Union with the Source of all Life. To know the Giver of Life, is to love him, and the more we know of him, the more love will we manifest. In this course of lessons, of which this is the first, we shall take up the subject of "Gnani Yoga"--the Yoga of Wisdom, and will endeavor to make plain some of its most important and highest teachings. And, we trust that in so doing, we shall be able to awaken in you a still higher realization of your relationship with the One, and a corresponding Love for that in which you live, and move and have your being. We ask for your loving sympathy and cooperation in our task. Let us begin by a consideration of what has been called the "Questions of Questions"--the question: "What is Reality?" To understand the question we have but to take a look around us and view the visible world. We see great masses of something that science has called "matter." We see in operation a wonderful something called "force" or "energy" in its countless forms of manifestations. We see things that we call "forms of life," varying in manifestation from the tiny speck of slime that we call the Moneron, up to that form that we call Man.