Only through the consistent application of discipline can we prevent the negative tendencies of life from destroying our plans. With the passing of a little time and the attainment of a little success, we can become careless. That is why those in pursuit of the good life must develop a new sense of appreciation for discipline, and become aware of all that they can do and all that they can have. What each of us can do is remarkable. People can do the most amazing things, once they have made the decision to tackle the disciplines that lead to a new philosophy, a new attitude, and a new and intense level of activity. What people will do, however, is sometimes disappointing.

When we know something that needs to be done but isn’t currently getting done, we often say, “I just need more discipline.” Actually, we need the habit of doing it. And we need just enough discipline to build the habit.

If there is one critical ingredient for your successful quest for both wealth and happiness, it is discipline.

Self-discipline is very important.

Discipline of mind and body is one of the most difficult things one has to acquire, but in the long run it is a valuable ingredient of education and a tremendous bulwark in time of trouble. Certainly, it is essential in meeting defeats and recovering from disaster. No matter how hard hit you are, you can face what has to be faced if you have learned to master your own fears.

Discipline, I learned, just means making choices in favor of your goals. It doesn't mean you're un-chill; it means you know what you want.

What is needed, however, isn't just that people working together be nice to each other. It is discipline.
Discipline is hard — harder than trustworthiness and skill and perhaps even than selflessness. We are by nature flawed and inconstant creatures. We can't even keep from snacking between meals. We are not built for discipline. We are built for novelty and excitement, not for careful attention to detail. Discipline is something we have to work at.

That's the beauty of discipline. It trumps everything. A lot of us are born with minimal talent, unhappy in our own skin and with the genetic makeup with which we were born. We have fucked-up parents, grow up bullied and abused, or are diagnosed with learning disabilities. We hate our hometown, our teachers, our families, and damn near everything about ourselves. We wish we could be born again as some other motherfucker in some other time and place. Well, I am proof that rebirth is possible through discipline, which is the only thing capable of altering your DNA. It is the skeleton key that can get you past all the gatekeepers and into each and every room you wish to enter. Even the ones built to keep you the fuck out! ...
Discipline builds mental endurance because when effort is your main priority, you stop looking for everything to be enjoyable. Our phones and social media have turned too many of us inside out with envy and greed as we get inundated with other people's success, their new cars and houses, big contracts, resort vacations, and romantic getaways. We see how much fun everyone else is having and feel like the world is passing us by, so we bitch about it and then wonder why we are not where we want to be.
When you become disciplined, you don't have time for that bullshit. p140

I believe that through discipline, though not through discipline alone, we can achieve serenity, and a certain small but precious measure of the freedom from the accidents of incarnation, and charity, and that detachment which preserves the world which it renounces. I believe that through discipline we can learn to preserve what is essential to our happiness in more and more adverse circumstances, and to abandon with simplicity what would else have seemed to us indispensable; that we come a little to see the world without the gross distortion of personal desire, and in seeing it so, accept more easily our earthly privation and its earthly horror — But because I believe that the reward of discipline is greater than its immediate objective, I would not have you think that discipline without objective is possible: in its nature discipline involves the subjection of the soul to some perhaps minor end; and that end must be real, if the discipline is not to be factitious. Therefore I think that all things which evoke discipline: study, and our duties to men and to the commonwealth, war, and personal hardship, and even the need for subsistence, ought to be greeted by us with profound gratitude, for only through them can we attain to the least detachment; and only so can we know peace.

discipline means being disciplined in all things, especially little things.

Discipline is the basic set of tools we require to solve life’s problems. Without discipline we can solve nothing. With only some discipline we can solve only some problems. With total discipline we can solve all problems.

Discipline is about facing your fears so you can conquer them. Discipline means taking the hard road — the uphill road. To do what is right. For you and for others. So often, the easy path calls us: To be weak for that moment. To break down another time. To give in to desire and short-term gratification.

Discipline creates lifestyle.

Discipline is just consistently separating how you feel from what you do.