Some beliefs come to us ready made from the culture and environment we are born into. When we are young, we believe what we are told about ourselves and the world, because we have no way of testing, and these beliefs may persist unmodified by our later achievements, because they had parental authority and became embedded as unconscious commands in the developing super-ego. Beliefs are not just maps of what has happened, but blueprints for future actions. This may be a valid statement at the present moment, but believing it is a description of your capability now and in the future, will programme your mind to fail, as it will prevent you finding out your potential capability. Limiting beliefs have no valid basis in experience.
Beliefs can be a matter of choice.
They change and develop. We think of ourselves differently, we marry, divorce, change friendships and act differently because our beliefs change. We have each created many beliefs about our possibilities and what is important in life, and we can change them. But it is no use attempting to do so in the context of structurally conflicting intentions. This creates a new tension-resolution system that is not in conflict and will be unstoppable.