Wondrous is the strength of cheerfulness, and its power of endurance -- the cheerful man will do more in the same time, will do it ;better, will preserve it longer, than the sad or sullen.
Source: In The Ultimate Success Quotations Library, 1997.
-- Thomas Carlyle, (Dec 4 1795-1881), Scottish essayist, historian; He was considered one of the era's great sages and man of letters; wrote The French Revolution, 1837.