To improve is to change, so to be perfect is to have changed often.
Sir Winston L. Churchill – British politician, 1940-45 and 1951-55 Prime Minister, Nobel Prize in literature 1953 (1874-1965), during a debate with Philip Snowden, 1st Viscount Snowden(June 23, 1925), in “His complete speeches, 1897–1963”, vol. 4 (1922–1928), p. 3706, Quotations book 2013