A demon visits you at three in the morning and whispers that you must relive your exact life, every joy and every humiliation, over and over for eternity. Would you curse it or call it the most liberating revelation you have ever heard? This episode unpacks the eternal return, tracing a single idea from a literal mechanical fact of the cosmos in classical antiquity through 19th-century thermodynamics, Nietzsche's existential test, esoteric mysticism, and the mathematics of closed dynamical systems.

We begin with the Pythagoreans and the Stoic engine of ekpyrosis and palingenesis, including Chrysippus's debate over whether the same Socrates or a copy returns. We follow Origen and Augustine's theological counterattack that straightened time into a line, then watch Blanqui's finite-matter math and Schopenhauer's psychology land on Nietzsche's  ...