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When you want to change a root thought, act in accordance with the new idea you have. But you must act quickly, or your mind will kill the idea before you know it. I mean that literally. The idea, the new truth, will be dead in you before you've had a chance to know it.
So act quickly when the opportunity arises, and, if you do this often enough, your mind will soon get the idea. It will be your new thought.