Here’s an interesting quote by William Walker Atkinson:

“Affirmation consists of the act or process of expressing in verbal form—in words—the statement of the thought or idea of that which you desire to materialize in objective reality. Words are crystallized thought. When an idea is expressed in words, it takes on additional strength and power.

The verbal expression of an idea gives to the latter a “body” and substance which it otherwise lacks. The “spoken word” was held by ancient occultists to have a mystical and esoteric significance and power. The experience of modern Mental Science (of various schools of interpretation of the basic principles of its teachings) has served to demonstrate the value of “Affirmations” in securing results of their idealistic thought directed toward practical ends.

The human race did very little intelligent or purposive thinking before it invented spoken language. Moreover, the greater and more adequate is the vocabulary of a people, or of an individual, the greater is the capacity for clear, definite thought on the part of that people or that individual. This does not mean that the more a person talks, or the more words he utters, the deeper is his thought—in fact, the reverse of such proposition is often found to be true. But it is true that the more
terms that a person has at his command for use in his thinking, the clearer and more definite will be his thought.

Words may be, and often are, employed to disguise or to conceal thoughts, or to conceal the lack of real thoughts and ideas: but without adequate terms, clear and close thinking is impossible.

Arnold Bennett says: “When a writer conceives an idea, he conceives it in the form of words. That form of words constitutes his style, and it is absolutely governed by the idea. The idea can only exist in words, it can only exist in one form of words. You cannot say exactly the same thing in two different ways. Slightly alter the expression, and you slightly alter the idea. A clear idea is expressed clearly, and a vague idea vaguely.” Hazlitt says: “Not only will an improvement in a thought improve its wording; an improvement in wording will improve the thought. To study clearness of statement is to study means of improving thought.”

Thus, you see, Affirmation has for one of its main purposes the strengthening of the thought or ideal, and the creation of a more clear, distinct, and definite outline of it. You may “hold the thought” of the thing or condition which you desire to materialize; you may form a strong mental picture of it; but neither the thought nor the picture will possess its full measure of strength or dearness until you embody the thought or idea, and describe the picture, in formal words”

To give power to your words, start with the course:
>>> Will Mastery