„Our psychology is … a science of mere phenomena without any metaphysical implications. [It] Treats all metaphysical claims and assertions as mental phenomena, and regards them as statements about the mind and its structure.“

— C.G. Jung

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„Physics is the Science of Matter; Metaphysics the Science of Mind — the Science of Being, apart from accidents and properties — Ontology.“
— Horace Mann
„The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.“
— Nikola Tesla