The image power of the mind is imagination, but just what imagination is and where it comes from nobody seems to know. A famous surgeon is reputed to have remarked that he had sliced open many a brain without ever having seen a picture or found a thought.
The imagination certainly is no more exclusive property of the brain than of an arm, a leg, or the stomach. Thinking is performed not by a part of the body or even the whole body but by the inhabitant within. It is that function which enables consciousness to know its surroundings and to know itself.
Only one who thinks is able to say, “I”. Only one who can say, “I” is able to cast up pictures within his own being, known to no others.
The eternal striving knowledge and capacity, the most apparent thing about life, is resolved always by two principal elements of the strife—the knower and the thing to be known.
By definition these appear to be separate, and we observe that a man ordinarily copes with the outer world by tabulating the manner in which it impinges upon his senses. A thing is so long and so wide and weighs so much and is so hard and a certain color.
A name is given it, and as long as each subsequent time it is encountered it maintains the majority of its original characteristics, a man recognizes it for what it is and knows it when he sees it. If you ask him if it is near, he is able to answer instantly, simply by glancing around.
If its presence produces some particular effect upon him, like fear or anger or love or tension, then the mere presence or absence of this object may be said to materially affect his life. In that case, his state of mind is not a matter of his own determination, but instead is the direct result of the object as he encounters it or avoids it in the outer-world.
Also see: Imagining Creates Reality