Perseverance

"Experience is a hard teacher because she gives the test first, the lesson afterwards."

"We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job."

"Three failures denote uncommon strength. A weakling has not enough grit to fail thrice."

"Excellence is not an act but a habit. The things you do the most are the things you will do the best."

"Can anything be sadder than work unfinished? Yes, work never begun."

"Ever tried. Ever failed. No matter. Try again. Fail again. Fail better."

"The man who makes no mistakes does not usually make anything."

"Challenges make you discover things about yourself that you never really knew. They're what make the instrument stretch - what makes you go beyond the norm."

"It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something."

"We either make ourselves miserable, or we make ourselves strong. The amount of work is the same."