In the book Hopeland a character declares “orthopraxy not orthodoxy” and, later, “doing not believing”.
Orthodox is the combination of two Greek words. Ortho means correct or upright. Dox means belief or opinion. The correct belief. Orthopraxy combines ortho with the word praxy, which means action, doing, or practice. The right deed, the right practice.
There is much orthodoxy on this planet and not enough orthopraxy.
I will not become a good guitar player by believing that I am good, but through practice. I would go so far as to say it doesn’t really matter what I believe because it is only what I do that matters. Nobody should care what I believe. My actions (or practice), on the other hand, matter. Believing is easy, doing is hard, which is why we would rather believe than do.
I think this applies to everything in life.