The Ego uses the 3 brains and you can say each one steals from the other.We must have equilibrium in our 3 brains.
That is a life time,life times,of work. We have to find the root cause of each defect with daily retrospection .
Ego ; From the Latin for "I" and similar to the Greek Εγώ. In Gnosis, the term ego is very different from the Freudian definition. In practical spirituality, the term ego refers to psychological constructs in the mind that trap the consciousness. The ego is a multiplicity of contradictory psychological elements that we have inside and are in their sum the “ego.” Each one is also called “an ego” or an “I.” Every ego is a psychological defect which produces suffering. The ego is three (related to our Three Brains or three centers of psychological processing), seven (capital sins) and legion (in their infinite combinations).
"The ego is the root of ignorance and pain." - Samael Aun Weor, The Esoteric Treatise of Hermetic Astrology
"The Being and the ego are incompatible. The Being and the ego are like water and oil. They can never be mixed... The annihilation of the psychic aggregates (egos) can be made possible only by radically comprehending our errors through meditation and by the evident Self-reflection of the Being." - Samael Aun Weor, The Pistis Sophia Unveiled