It is not the critic who counts, not the man who points out how the strong man stumbled, or where the doer of deeds could have done better.
The credit belongs to the man who is actually in the arena; whose face is marred by the dust and sweat and blood; who strives valiantly; who errs and comes short again and again;
who knows the great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best, knows in the end the triumph of high achievement, and who, at worst, if he fails, at least fails while daring greatly; so that his place shall never be with those cold and timid souls who know neither victory nor defeat.—Theodore Roosevelt

Source: American Heritage Book of Great American Speeches for Young People, Suzanne McIntire