us consider the teaching in detail in this lesson, and in portions of
others to follow.

Let us begin with a consideration of the instruments of the Ego, and the
material with which and through which the Ego works. Let us realize that
the physical body of man is identical in substance with all other forms
of matter, and that its atoms are continually changing and being
replaced, the material being drawn from the great storehouse of matter,
and that there is a Oneness of matter underlying all apparent differences
of form and substance. And then let us realize that the vital energy or
_Prana_ that man uses in his life work is but a portion of that great
universal energy which permeates everything and everywhere, the portion
being used by us at any particular moment being drawn from the universal
supply, and again passing out from us into the great ocean of force or
energy. And then let us realize that even the mind, which is so close to
the real Self that it is often mistaken for it--even that wonderful thing
Thought--is but a portion of the Universal Mind, the highest emanation of
the Absolute beneath the plane of Spirit, and that the Mind--substance or
_Chitta_ that we are using this moment, is not ours separately and
distinctly, but is simply a portion from the great universal supply,
which is constant and unchangeable. Let us then realize that even this
thing that we feel pulsing within us--that which is so closely bound up
with the Spirit as to be almost inseparable from it--that which we call
Life--is but a bit of that Great Life Principle that pervades the
Universe, and which cannot be added to, nor subtracted from. When we have
realized these things, and have begun to feel our relation (in these
particulars) to the One Great Emanation of the Absolute, then we may
begin to grasp the idea of the Oneness of Spirit, and the relation of the
"I" to every other "I," and the merging of the Self into the one great
Self, which is not the extinction of Individuality, as some have
supposed, but the enlargement and extension of the Individual
Consciousness until it takes in the Whole.

In Lessons X and XI, of the "Advanced Course" we called your attention to
the Yogi teachings concerning _Akasa_ or Matter, and showed you that all
forms of what we know as Matter are but different forms of manifestation
of the principle called _Akasa_, or as the Western scientists call it,
"Ether." This Ether or _Akasa_ is the finest, thinnest a