When we combine the behavioral realm with the cognitive and emotional realms, the full picture of self-mastery comes into view. These domains represent the ability to become the self of your highest vision. To resist the many forces which would lead you away from it. Self-mastery represents the degree to which you are capable of aligning with your own ideals. In other words, it is your ability to become a great individual and live a great life – by your own standards. The capacities found in the various forms of self-mastery like wisdom, equanimity, and self-control are not merely important virtues. They are the prerequisite, second-order virtues that enable all other strengths to emerge.
— Designing the Mind: The Principles of Psychitecture by Ryan A. Bush