“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!”

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.

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.

Oxford Union Debate (3 December 1964)

Address at Des Moines, Iowa, (4 October 1932)

Vice and Virtue, ii
The Note-Books of Samuel Butler (1912), Part II - Elementary Morality

Choruses from The Rock (1934)

1790s, Letter to the Addressers (1792)
Context: A thing, moderately good, is not so good as it ought to be. Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.

Song, Every Blossom I See Reminds Me of You, written for Ziegfeld Follies of 1920 (music by Harry Ruby).

Source: Clockwork Princess