"Practical life is a marvelous school. So, through interaction with others we can discover those "I's" that we carry within our interior. Any annoyance, any incident, can lead us through inner Self-observation to the discovery of any "I," whether it be of self-esteem, envy, jealousy, anger, covetousness, suspicion, calumny, lust, etc."

- Samael Aun Weor, Treatise of Revolutionary Psychology