Emotional maturity is the ability to stick to a job and to struggle through until it is finished, to endure unpleasantness, discomfort and frustration.
— Edward Strecker
It’s not whether you get knocked down; it’s whether you get up again.
— Vince Lombardi
So long as there is breath in me, I will persist. For now I know one of the greatest principles of success: if I persist long enough I will win.
— Og Mandino
I never wrote anything that was published until I was forty.
— James Michener
We all make mistakes, but the winner knows that success comes from perseverance: trying, failing, learning and doing it again until he succeeds. Most important, a winner does not waste energy by scolding or berating himself. He keeps practicing, takes a break and tries again.
— Judy Ford