Self-discipline is treating yourself as you would like to be treated by others.
When you meet a new person, the esteem your have for them is going to be dependent on how honest they are. The trust you have for them will be dependent on how dependable and discreet they are. And the love that you have for them is going to be dependent on how kind they are. Self-discipline is how you cultivate that same relationship with yourself.
Self-discipline means treating yourself kindly, and giving yourself what’s best for you long-term, and not just what seems appealing to you right now. It means practicing radical honesty and holding yourself accountable for your behaviours and coming to terms with your strengths and weaknesses. It also means developing self-trust by making the promises that you keep to yourself. Self-discipline is the foundation of self-esteem and a healthy self-love. Self-discipline is how you strengthen the most intimate relationship you’ll ever have: The one with yourself.