Self-discipline is defined as the ability to regulate one's conduct through principles and sound judgment rather than impulse or desire. The five pillars of self-discipline are acceptance, willpower, hard work, industry, and persistence. While passion is an intense emotion, self-discipline is more important for business success as it allows one to take action regardless of emotional state. An effective personal goal setting model is the SMART model, where goals are specific, measurable, action-oriented, realistic, and timely.