This quote from Theodore Roosevelt comes from his speech titled "Citizenship in a Republic" that he gave at the Sorbonne in Paris, France, on April 23, 1910. This quote is one notable passage from the speech and is referred to as "The Man in the Arena". "The man in the arena" is often referred to as someone who is heavily involved in a situation that requires courage, skill, or tenacity, as opposed to someone sitting on the sidelines and watching.
Quote Reads:
“It is not the critic who counts; not the man who points out how the strong man stumbles, 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 dust and sweat and blood; who strives valiantly; who errs, comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows 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 the worst, if he fails, at least he fails while daring greatly, so that his place shall never be with those cold and timid souls who knew neither victory nor defeat.”