Heretics have been hated from the beginning of recorded time; they have been ostracized, exiled, tortured, maimed, and butchered; but it has generally proved impossible to smother them; and when it has not, the society that has succeeded has always declined.

"A Fanfare for Prometheus" (29 January 1955); also in The Spirit of Liberty: Papers and Addresses (1952), p. 131.