You must, therefore, understand and examine your beliefs, realize that they form your experience, and consciously change those that do not give the effects you want. In such an examination you will be aware of many excellent beliefs that work for you. Trace these through. See how they were followed by your imagination and emotions. If possible, look in your own past for points where recognizable new ideas came to you and beneficially changed your experience.
Ideas not only alter the world constantly, they make it constantly.