Born in 1834 and educated in Berlin, Ernst Haeckel formed the German Monist League. A pantheistic philosophical society that proposed the unity of all organic and physical nature. 'In monism, the universe is only composed of one substance—matter—and any intelligence or “soul” must be an inherent property of that sole substance.'
Ernst Haeckel's theories on evolutionary biology and monism attracted many leading atheist thinkers of the day, including none other than Lenin himself. Although, it seems Ernst Haeckel wasn't quite the atheist history has painted him out to be.
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