perceive the two aspects of the things which the word is intended to
express. In the first place the word "Mind" is used as synonymous
with _Chitta_, or Mind-substance, which is the Universal Mind Principle.
From this _Chitta_, Mind-substance, or Mind, all the material of the
millions of personal minds is obtained. The second meaning of the word
"Mind" is that which we mean when we speak of the "mind" of anyone,
thereby meaning the mental faculties of that particular person--that
which distinguishes his mental personality from that of another. We have
taught you that this "mind" in Man, functions on three planes, and have
called the respective manifestations (1) the Instinctive Mind; (2) the
Intellect; and (3) the Spiritual Mind. (_See "Fourteen Lessons in Yogi
Philosophy," etc._) These three mental planes, taken together, make up
the "mind" of the person, or to be more exact they, clustered around the
"I" form the "soul" of the individual. The word "soul" is often used as
synonymous with "spirit" but those who have followed us will distinguish
the difference. The "soul" is the Ego surrounded by its mental
principles, while the Spirit is the "soul of the soul"--the "I," or Real
Self.

The Science of _Raja Yoga_, to which this series of lessons is devoted,
teaches, as its basic principle, the Control of the Mind. It holds that
the first step toward Power consists in obtaining a control of one's
own mind. It holds that the internal world must be conquered before the
outer world is attacked. It holds that the "I" manifests itself in
Will, and that that Will may be used to manipulate, guide, govern and
direct the mind of its owner, as well as the physical world. It aims to
clear away all mental rubbish, and encumbrances--to conduct a "mental
house-cleaning," as it were, and to secure a clear, clean, healthy mind.
Then it proceeds to control that mind intelligently, and with effect,
saving all waste-power, and by means of concentration bringing the Mind