I do not know much about Theodore Roosevelt but these words of his resonate with me.
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 them 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, who 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 fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.1
I had breakfast this morning with a friend with whom I previously worked very hard. We were involved in an endeavor that was about risk and experiment; great joy and tremendous sorrow. It reminded me that I want to be one who is in the arena; even if it means I make mistakes and have failures. I want to spend myself in the worthiest of causes; even if I might fail while daring greatly. I have known both victory and defeat; I rejoice that I continue to learn from both.
1 Theodore Roosevelt, Citizen of the Republic Speech, April 23, 1910; (http://www.goodreads.com/quotes/7-it-is-not-the-critic-who-counts-not-the-man); also quoted in Daring Greatly by Brene Brown.