Self-mastery refers to the ability to control and manage oneself. It is an important trait to have, especially when you are trying to achieve your goals. It is also the foundation of personal development and success. Synonyms for self-mastery can include self-discipline, self-control, self-restraint, self-regulation, self-governance, self-command, and self-possession. These terms describe the same concept of being in control of oneself, but each one portrays a slightly different angle. Self-discipline emphasizes the need to resist temptation, while self-regulation stresses managing emotions. Self-command and self-possession emphasize the ability to remain cool under pressure. All of these synonyms for self-mastery are important to know when striving to master one's self.