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 up short again and again , because there is no effort without error or shortcoming , but who knows the great enthusiasms , the great devotions , who spends himself for 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 .