Here’s an interesting quote by Charles Haanel:

“When the creative power of thought is fully understood, its effect will be seen to be marvelous. But such results cannot be secured without proper application, diligence and concentration. The student will find that the laws governing in the mental and spiritual world are as fixed and infallible as in the material world. To secure the desired results, then, it is necessary to know the law and to comply with it. A proper compliance with the law will be found to produce the desired result with invariable exactitude. The student who learns that power comes from within, that he is weak only because he has depended on help from outside, and who unhesitatingly throws himself on his own thought, instantly rights himself, stands erect, assumes a dominant attitude, and works miracles.

Scientists tell us that we live in the universal ether. This is formless, of itself, but it is pliable, and forms about us, in us and around us, according to our thought and word. We set it into activity by that which we think. Then that which manifests to us objectively is that we have thought or said.

Thought is governed by law. The reason we have not manifested more faith is because of lack of understanding. We have not understood that everything works in exact accordance with definite law. The law of thought is as definite as the law of mathematics, or the law of chemistry, or the law of electricity, or the law of gravitation. When we begin to understand that happiness, health, success, prosperity and every other condition or environment are results, and that these results are created by right thinking, either consciously or unconsciously, we shall realize the importance of a working knowledge of the laws governing thought.

Those coming into a conscious realization of the power of thought find themselves in possession of the best that life can give; substantial things of a higher order become theirs, and these sublime realities are so constituted that they can be made tangible parts of daily personal life. They realize a world of higher power, and keep that power constantly working. This power is inexhaustible, limitless, and they are therefore carried forward from victory to victory. Obstacles that seem insurmountable are overcome. Enemies are changed to friends, conditions are overcome, elements transformed, fate is conquered.

The supply of good is inexhaustible, and the demand can be made along whatever lines we may desire. This is the mental law of demand and supply.”