Here’s an interesting quote by William Walker Atkinson:

“I wish to invite you to the consideration of a great principle of Nature — a great natural force that manifests its activities in the phenomena of Dynamic Mentation—a great Something the energies of which I have called “Mind-Power.”

My thought on the subject is based upon the fundamental conception that: there exists in Nature a Dynamic Mental Principle—a Mind-Power—pervading all space—immanent in all things—manifesting in an infinite variety of forms, degrees, and phases.

I hold that this energy, or force, or dynamic principle, is no respecter of persons. Its service, like that of the sun and rain, and all natural forces, is open to all—just and unjust; good and bad; high and low; rich and poor. It responds to the proper efforts, no matter by whom exerted, or for what purpose called into effect. But the proper effort must be exerted, consciously or unconsciously, else there will be no operation of the force.

I believe that the activities of this dynamic mental principle are intimately correlated to manifestations of the mental operations known to us as desire, will, and imagination.

I have postulated of my conception of Mind-Power that it pervades all space—is immanent in all things—and manifests in an infinite variety of forms, degrees, and phases.

But, it may be urged, this is nothing more than science claims for the principle of physical energy—then is Mind-Power identical with the physical energy of science? — is it nothing more than a high form of mechanical or material energy? No, Mind-Power is very far from being a blind, mechanical energy—it is a living, mental force, which I hold is behind the manifestations of physical energy and mechanical force.

It is not the physical energy of science, but is something of the nature of a living will, which is rather the cause of physical energy, than identical with it.

Let us take a familiar example. You desire to move your hand—and it moves. Why? Because of the manifestation of the wonderful and mysterious force called “will” which is stored up within you, and which you have released to move the hand. You send a current of nerve-force which is really a manifestation of Mind-Power or will-force from your brain, along the nerves of the arm, which contracts the muscles of the arm and hand, and your desire is gratified. Your desire, or wish, set into motion the Mind-Power which acted upon the material substance of your body and caused it to act. What was it that flowed along the nerve wires? Was it electricity, or
magnetism? No! it was that subtle and mysterious thing that I am calling Mind-Power, and which is bound up with the will principle of mind.

Mind-Power is an actual living force. It is the force that makes plants grow—and animal bodies grow—and which enables all living things to move and act. It is the force which enables the growing mushroom to raise up the slabs of paving stone—or causes the roots of a tree to split open the great boulders, into the crevices of which they have crept. Mind-Power is not an abstraction or speculative nothing—it is an existent, living, mental, acting force, manifesting sometimes with an appalling power, and sometimes with a delicate, subtle touch that is almost imperceptible, but which accomplishes its purpose.

Several years ago I told a friend of this conception, and after he had listened to me attentively and with interest, he reflected a few moments, and then suddenly asked: “But where do I come in?” And that is the question that many of you are asking now, no doubt. Well, while here I cannot dip into metaphysics or philosophical speculation, or even into my favorite occult sources, I will say that each of you is a Centre of Power in that Ocean of Dynamic Mind-Power and each “I” is a master of the power. You have the Whole Thing back of you—and you are free to draw upon it for all that your channel will carry to you. And you are allowed to enlarge your channel.”

What Atkinson is referring here, is exactly what we train in the Will Mastery course! You understand that you are a “Centre of Power” and you can tap into that unlimited resource anytime you want to.