If I had permitted my failures, or what seemed to me at the time a lack of success, to discourage me I cannot see any way in which I would ever have made progress.
Source: The Autobiography of Calvin Coolidge, 1929.
-- Calvin Coolidge, (Jul 4 1872-1933), US president (30th), lawyer; He assumed office on death of Harding, 1923; re-elected, 1924.