Grit is not just simple elbow-grease term for rugged persistence. It is an often invisible display of endurance that lets you stay in an uncomfortable place, work hard to improve upon a given interest, and do it again and again.

We thrive not when we've done it all, but when we still have more to do.

Pain is not a punishment. And pleasure is not a reward. You could argue that failure is not punishment and Success is not reward. They're just failure and success. You can choose how you respond.

Mastery is in constantly wanting to close the gap between where you are and where you want to be.

Mastery is in the reaching, not in the arriving.

Completion is a goal, but we hope it is never the end.

Masters are not experts because they take a subject to its conceptual end. They are masters because they realize that there isn't one. On utterly smooth ground, the path from aim to attainment is in the permanent future.