There is something in the old Zoroastrian doctrines after all. Ormuzd and Ahriman are ever at war for the world: Stupidity and Wisdom are ever struggling in battle. Every great truth has to fight its way anew. Enemies are obstinate and entrenched, while the memory of man is weak.
-- Notebooks Category 11: The Negatives > Chapter 4: In Thoughts, Feelings, Violent Passions > # 40