The professional respects his craft. He does not consider himself superior to it. He recognizes the contributions of those who have gone before him. He apprentices himself to them.

Nothing fires the warrior’s heart more with courage than to find himself and his comrades at the point of annihilation, at the brink of being routed and overrun, and then to dredge not merely from one’s own bowels or guts but from one’s discipline and training the presence of mind not to panic, not to yield to the possession of despair, but instead to complete those homely acts of order which Dienekes had ever declared the supreme accomplishment of the warrior: to perform the commonplace under far-from-commonplace conditions.

Making a judgment, taking a stand and then acting against an injustice or acting to support excellence is the stuff of the everyman hero. If you are an aspiring artist and you wish to avoid “judgments,” you'll find that you have nothing to say.

For what can be more noble than to slay oneself? Not literally. Not with a blade in the guts. But to extinguish the selfish self within, that part which looks only to its own preservation, to save its own skin. That, I saw, was the victory you Spartans had gained over yourselves. That was the glue. It was what you had learned and it made me stay, to learn it too.

The Principle of Priority states (a) you must know the difference between what is urgent and what is important, and (b) you must do what’s important first.

The amateur believes he must first overcome his fear; then he can do his work. The professional knows that fear can never be overcome. He knows there is no such thing as a fearless warrior or a dread-free artist.

The difference between an amateur and a professional is in their habits. An amateur has amateur habits. A professional has professional habits. We can never free ourselves from habit. But we can replace bad habits with good ones.