It is not the critic who counts. … 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, 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 or defeat.
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Gender-inclusive version:

It is not the critic who counts. … The credit belongs to the person who is actually in the arena; whose face is marred by the dust and sweat and blood; who strives valiantly … who, at worst, if he or she fails, at least fails while daring greatly; so that his or her place shall never be with those cold and timid souls who know neither victory or defeat.