When I attempt new things, I make it a habit to be successful. That would make for a great tweet. But the deeper truth is, I become successful at many things because I create the necessary habits to do so.
You don’t practice self-discipline for success, because there really isn’t any self-discipline for that. If we break down what you really do to become successful, it is you employ your self-discipline into creating daily habits. (Exercise, eat healthy, meditation or self-development time, learning, etc.) You don’t create your future with self-discipline. You create your daily habits with self-discipline and those daily habits are what makes you successful.
Therefore, the purpose of self-discipline is to build positive, productive habits. Victors do daily what victims do only occasionally.