Some value of discipline is in isolated moments of action. Most value of discipline is in extended impact over time. One difficult but disciplined conversation could change a relationship. 100 difficult but disciplined conversations will change a relationship.
Life goes up and down but the discipline you want is the kind that endures. It may fail you in a moment you need it because it isn’t strong enough yet, but let it be resilient. Get up where you fell down and return to the effort with a new understanding.