If you can keep on trying after three failures in a given undertaking you may consider yourself a 'suspect' as a potential leader in your chosen occupation. If you can keep on trying after a dozen failures the seed of a genius is germinating within your soul.
Napoleon HillThe majority of people are ready to throw their aims and purposes overboard, and give up at the first sign of opposition or misfortune. A few carry on DESPITE all opposition, until they attain their goal. These few are the Fords, Carnegies, Rockefellers, and Edisons. There may be no heroic connotation to the word persistence, but the quality is to the character of man what carbon is to steel.
Napoleon HillIf you give up before your goal has been reached, you are a "quitter." A QUITTER NEVER WINS AND A WINNER NEVER QUITS. Lift this sentence out, write it on a piece of paper in letters an inch high, and place it where you will see it every night before you go to sleep, and every morning before you go to work
Napoleon Hill