I’m back to inviting readers to submit quotations whose origins they want me to try to trace, using my book, The Yale Book of Quotations, and my more recent researches.
"Okay, but did he say the quotation in question?" [i.e., did Yogi Berra actually say, "I never said most of the things I said." From three weeks ago.]
According to the ever-helpful Yale Book of Quotations, Sports Illustrated, March 17, 1986, quoted Berra as saying "I really didn't say everything I said."