Productivity

"John Wesley traveled 250,000 miles on horseback, averaging twenty miles a day for forty years; preached 4,000 sermons; produced 400 books; knew ten languages.  At eighty-three he was annoyed that he could not write more than fifteen hours a day without hurting his eyes, and at eighty-six he was ashamed he could not preach more than twice a day.  He complained in his diary that there was an increasing desire to lie in bed until 5:30 in the morning."