It's a Good Point

"One doesn't always have to say what one thinks."
-Senator Morton (Leo G. Carroll)
Strangers on a Train (1951)
Patricia Highsmith (novel), Whitfield Cook (adaptation), Raymond Chandler (screenplay), Czenzi Ormonde (screenplay), Ben Hecht (uncredited)
(I suspect Highsmith wrote this line, but I don't have a copy of the novel to hand to verify.)