A nation which, in the name of loyalty or of patriotism or of a sincere and high-sounding idea, discourages criticism and dissent, and puts a premium on acquiescence and conformity, is headed for disaster.

Henry Steele Commager (1902-1998) American historian, writer, activist

“What Ideas Are Safe?” Saturday Review (5 Nov 1949)
    (Source)

Reprinted in Freedom and Order (1966).