Stalin: Contrary to idealism, which asserts that only our consciousness really exists, and that the material world, being, nature, exists only in our consciousness' in our sensations, ideas and perceptions, the Marxist philosophical materialism holds that matter, nature, being, is an objective reality existing outside and independent of our consciousness; that matter is primary, since it is the source of sensations, ideas, consciousness, and that consciousness is secondary, derivative, since it is a reflection of matter, a reflection of being; that thought is a product of matter which in its development has reached a high degree of perfection, namely, of the brain, and the brain is the organ of thought; and that therefore one cannot separate thought from matter without committing a grave error. https://wordsmith.social/protestation/quotes#quote5838