Faith is a State of Mind Which May Be Induced By Auto-Suggestion.
It is a well-known fact that one comes, finally, to believe whatever one repeats to one’s self, whether the statement be true or false. If a man repeats a lie over and over, he will eventually accept the lie as truth. Moreover, he will believe it to be the truth. Every man is what he is because of the dominating thoughts which he permits to occupy his mind. Thoughts which a man deliberately places in his own mind, and encourages with sympathy, and with which he mixes any one or more of the emotions, constitute the motivating forces which direct and control his every movement, act, and deed!
~ Napoleon Hill, Think and Grow Rich (1937)