One of the most powerful concepts, one which is a sure cure for lack of confidence, is the thought that God is with you and helping you. This is one of the simplest teachings in religion, namely, that Almighty God will be your companion, will stand by you, help you, and see you through. No other idea is so powerful in developing self-confidence as this simple belief when practiced. To practice it simply affirm “God is with me; God is helping me; God is guiding me.” Spend several minutes each day visualizing his presence. Then practice believing that affirmation. Go about your business on the assumption that what you have affirmed and visualized is true. Affirm it, visualize it, believe it, and it will actualize itself. The release of power which this procedure stimulates will astonish you.
The Power of Positive Thinking by Norman Vincent Peale