I couldn't stand the pain. All the doctors said there was nothing wrong with my spine because there was nothing they could see. But the chiropractors said they thought they could help and they did.
Source, in full
From his 1971 World Series MVP acceptance speech, recalling the time in 1957 when he considered quitting baseball, as quoted in "Pittsburgh's Clemente Honored" by United {Press International, in The Wilmington Star-News (Thursday, October 21, 1971), p. 1-D