This document summarizes four principles of human psychological functioning: 1) Each person's ability to think and form their own thought system shapes their personal reality. 2) No two people have identical thought systems, so each person lives in their own separate reality. 3) A person's level of conscious understanding of their own thinking affects their perception of reality. 4) Feelings and emotions indicate the quality and direction of a person's psychological functioning and level of consciousness. Understanding these principles allows people to recognize how their own thinking creates their experiences and perceptions.