A study of the history of opinion is a necessary preliminary to the emancipation of the mind.

I do not know which makes a man more conservative - to know nothing but the present, or nothing but the past.

John Maynard Keynes, The End of Laissez-Faire, 1926

God, give us Grace to accept with serenity the things that cannot be changed, Courage to change the things which should be changed, and the Wisdom to distinguish the one from the other.

Richard Niebuhr, Serenity Prayer, 1943

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