You can easily detect who do and who does not believe in themselves. Anyone subjected to the idea of 'seeing is believing' does not completely believe in themselves, as they are constantly subjected to the single idea of the outside, subjected into believing more in only what they can see; which is merely one of the five physical sensory inputs. A person who understands this bends it the other way, into 'believing is seeing', where the informational perception is adopted, transformed and finally something to overcome and master, as the person believes primarily in itself and its own perception and projection rather than only in what is directly outside. You cannot control a person who believes in itself, but a person who solely believes in the outside, can be commanded like a slave, a slave to its eyes.