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POPSBeliefs: the underpinnings of self esteem As we work on this issue of self esteem, it's important to know what you believe. I don't mean what your parents told you that you had to believe, or a teacher, or – anybody else. What do you believe? About what? About everything! Your belief system serves as the foundation for what you think, do say and how you feel and react to life around you and how you perceive yourself.