“I would remind you that extremism in the defense of liberty is no vice.”
Barry Goldwater's speech http://www.c-span.org/video/?4018-1/goldwater-1964-acceptance-speech accepting the Republican presidential nomination, written by Karl Hess, delivered 16 July 1964, San Francisco.
Context: I would remind you that extremism in the defense of liberty is no vice.And let me remind you also that moderation in the pursuit of justice is no virtue.