That which knows all things and is known by none is the subject. It is accordingly the supporter of the world, the universal condition of all that appears, of all objects, and it is always presupposed; for whatever exists, exists for the subject. Everyone finds himself as this subject, yet only in so far as he knows, not in so far as he is object of knowledge.

— Arthur Schopenhauer The World As Will and Representation Vol. I and II (1844)

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