There is no sadder sight than a young pessimist, except an old optimist.
Source: Notebook, ch. 34, entry for 27 Dec. 1903.; ed. Albert Bigelow Paine, 1935.
-- Mark Twain, (Nov 30 1835-1910), US novelist, journalist, river pilot; The Great American humorist was also known as The People's Author and creator of Tom Sawyer and Huck Finn.