There are men whose eye and hand are so quick and so sure that they achieve a perfection of marksmanship to which no practice will enable ordinary men to attain.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“He was my groomsman, my best man, when I was married—at St. George's, Hanover Square, which made me feel as if I were living in one of Thackeray's novels. My own experience as regards marksmanship was much the same as my experience as regards horsemanship. There are men whose eye and hand are so quick and so sure that they achieve a perfection of marksmanship to which no practice will enable ordinary men to attain. There are other men who cannot learn to shoot with any accuracy at all. In between come the mass of men of ordinary abilities who, if they choose resolutely to practice, can by sheer industry and judgment make themselves fair rifle shots.” source