Forgive your enemies, but never forget their names.

The great enemy of the truth is very often not the lie — deliberate, contrived and dishonest — but the myth — persistent, persuasive, and unrealistic. Commencement address, Yale University, New Haven, Connecticut (11 June 1962)

Conformity is the jailer of freedom and the enemy of growth. Address to the UN General Assembly (25 September 1961)