Whatever you focus your attention on, you increase. This one principle is the key to mastering any trait and skill.

A person who focuses on building his self-image will eventually think like a person who has a positive self-image. He will feel like a person who has a positive self-image. He will speak and act the way a person with a positive self-image speaks and acts. I have elaborated on this in my book Building Your Self-Image and the Self-Image of Others.