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 and comes short again and again  who knows the great enthusiasms  the great devotions  and 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 know neither victory nor defeat.
Theodore Roosevelt
failures, mistakes