Discipline, or as used in the Nine Noble Virtues “self” discipline.
When we find our own truths we then can develop our own set of ethics.
We must be true and honorable and live up to that set of ethics. And there is where we need discipline. To a lot of people discipline is a “bad” word. But self-discipline is like a muscle. We have to train or discipline that muscle in order for it to grow strong.