(3) Then read in the "Advanced Lessons" about Energy or Force, in the oneness underlying its various manifestations. Consider how one form of Energy may be transformed into another, and so on around the circle, the one principle producing the entire chain of appearances. Realize that the energy within you by which you move and act, is but one of the forms of this great Principle of Energy with which the Universe is filled, and that you may draw to you the required Energy from the great Universal supply. But above all endeavor to grasp the idea of the Oneness pervading the world of Energy or Force, or Motion. See it in its entirety, rather than in its apparent separateness. These steps may appear somewhat tedious and useless, but take our word for it, they are all helps in fitting the mind to grasp the idea of the Oneness of All. Each step is important, and renders the next higher one more easily attained. In this mental drill, it will be well to mentally picture the Universe in perpetual motion--everything is in motion--all matter is moving and changing its forms, and manifesting the Energy within it. Suns and worlds rush through space, their particles constantly changing and moving. Chemical composition and decomposition is constant and unceasing, everywhere the work of building up and breaking down is going on. New combinations of atoms and worlds are constantly being formed and dissolved. And after considering this Oneness of the principle of Energy, reflect that through all these changes of form the Ego--the Real Self--YOU--stand unchanged and unharmed--Eternal, Invincible, Indestructible, Invulnerable, _Real_ and Constant among this changing world of forms and force. You are above it all, and it revolves around and about you--Spirit. (4) Read what we have said in the "Advanced Course" about Force or Energy, shading into Mind-substance which is its parent. Realize that Mind is back of all this great exhibition of Energy and Force that you have been considering. Then will you be ready to consider the Oneness of Mind. (5) Read what we have said in the "Advanced Lessons" about Mind-substance. Realize that there is a great world of Mind-substance, or an Universal Mind, which is at the disposal of the Ego. All Thought is the product of the Ego's use of this Mind-substance, its tool and instrument. Realize that this Ocean of Mind is entire and Whole, and that the Ego may draw freely from it. Realize that _You_ have this great ocean of Mind at your command, when you unfold sufficiently to use it. Realize that Mind is back of and underneath all of the world of form and names and action, and that in that sense: "All is Mind," although still higher in the scale than even Mind are _You_, the Real Self, the Ego, the Manifestation of the Absolute.