Kinda true though. The world you witness is filtered through your subconscious to turn raw data into concepts your conscious mind can deal with: book, car, chair, dog, etc. That's why optical illusions work, your mind gets used to interpreting the raw data a certain way, and that can be cleverly exploited to make your conscious mind see things that weren't in the raw data. "Belief" is just loading up a new subroutine to your subconscious to filter for something you value. But if you don't really convince yourself, it won't stick. You can't just ask your subconscious nicely to do things, it's to "dumb" for that. You have to imprint with rituals and such to strengthen associations.