The phrase "one's formula for success" refers to an individual's personal approach or method towards achieving a goal, accomplishing something or being successful in life. It is the unique set of principles, beliefs and strategies that someone uses as a guide to help them achieve their desired outcome. This could include habits, behaviors, mindsets, values, skills, and other factors that contribute to one's ability to succeed. The phrase suggests that success is not just based on luck or chance but rather the result of deliberate actions and choices made by an individual.