There this unhappy person perhaps scowls at their less-then-attractive form in the mirror. Defects of appearance are noted and perhaps amplified to muse over later. As this person attempts to begin their day, they are already drawing negative correlations between the things they see in their environment and what they are experiencing inside, in the consciousness, in the personal identity. They will then spend the rest of the day validating their negative state of consciousness by noting other negative correlations that they discover in the home, on the job, everywhere they go. Thus you could say that the ego notes the perceived negative characteristics within the Personal Reality as the intellect proves them to be quite true; a fact of life, as it were. This is how beliefs are formed.