How is self-discipline defined?

Self-discipline is best defined as the control of oneself for personal betterment. This concept emphasizes the ability to manage one's own actions, impulses, and emotions in a way that is directed toward achieving personal goals and improving oneself. It entails making conscious decisions that may involve delaying gratification, resisting temptations, and persisting through challenges in order to attain a desired outcome. This intrinsic motivation is crucial for personal development and is a key factor in achieving long-term success.

The other options reflect various forms of influence or control but do not encapsulate the true essence of self-discipline. Training by others for improvement suggests external guidance rather than internal control. A method of external regulation implies that the control or discipline is imposed from outside rather than stemming from within. Following orders without question indicates compliance, which lacks the self-directed aspect underpinning self-discipline. In contrast, the correct answer highlights the importance of personal agency in the journey toward self-improvement.