Captain Newman, M. D - 1962. This is also sometimes attributed to Leo Buscaglia, who often quoted it in his addresses and in his book Living, Loving and Learning - 1982.
A common misconception is to attribute the final part of this quote to W.C. Fields himself, it was actually first said about him by Rosten during a "roast" of Fields at the Masquer's Club in Hollywood in 1939, as Rosten explains in his book, The Power of Positive Nonsense - 1977.
Those who mind don't matter, and those who matter don't mind.
Bernard Baruch in response to a question by Igor Cassini as to how he handled the seating arrangements at his dinner parties, as quoted in Shake Well Before Using: A New Collection of Impressions and Anecdotes Mostly Humorous (1948) by Bennett Cerf, p. 249; the full response was "I never bother about that. Those who matter don't mind, and those who mind don't matter."
Attributed to William F. Buckley Jr. This appears to be a variant of a widely disseminated Republican joke with no published attribution of its authorship to Buckley. Variant 1: They told me if I voted for Goldwater in 1964, that we'd have more war and higher prices. Well, I did, and we do. - Mark Hatfield, as quoted in The Condition of Republicanism - 1968, by Nick Thimmesch Variant 2: They told me if I voted for Goldwater we'd be at war in Vietnam in six months - and I did and we were. - Anonymous voter, as quoted in It All Comes Back to Me Now : Character Portraits from the "Golden Apple" - 2001 by William O'Shaughnessy,
The Church recruited people who had been starched and ironed before they were washed.
John Wesley Lord, as quoted in TIME magazine - 1 February 1963.