„It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.“

— Aleister Crowley

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„Translation: As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.“
— Albert Einstein
„The sole "property" of matter with whose recognition philosophical materialism is bound up is the property of being an objective reality, of existing outside the mind.“
— Vladimir Lenin
„In dreams you don't need to make any distinctions between things. Not at all. Boundaries don't exist. So in dreams there are hardly ever collisions. Even if there are, they don't hurt. Reality is different. Reality bites. Reality, reality.“
— Haruki Murakami
„We often discussed his notions on objective reality. I recall that during one walk Einstein suddenly stopped, turned to me and asked whether I really believed that the moon exists only when I look at it.“
— Albert Einstein