Wash the windows and let the sun shine in. Beliefs also come from past experiences. That is why it is so important to experience success on a regular basis. Set small, achievable goals, and then reach them. When you start to experience success, then you start to believe in success, and that leads to more and bigger successes.
Beliefs come from knowledge.
The more you learn, the more things you'll know to be possible. Always take advantage of opportunities to learn something new. It will bring new possibilities into your beliefs and your life. Most importantly, you can develop new beliefs by setting and visualizing goals for your own life. Define your goals clearly and with precision.