Religion finally severed the unity which all willed but none could trust. An heroic nation of monotheists sought to impose its faith on a vaguely pantheist world. For the first and last time the Second Men stumbled into a world-wide civil war; and just because the war was religious it developed a brutality hitherto unknown.
Chapter VII: The Rise of the Second Men; Section 3, The Zenith of the Second Men (p. 110) - Last and First Men (1930)