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In page Noumenon:

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The noumenon's original meaning of "that which is thought" is not compatible with the "thing-in-itself," the latter being Kant's term for things as they exist apart from their existence as images in the mind of an observer.[citation needed] In a footnote to this passage, Schopenhauer provides the following passage from the Outlines of Pyrrhonism (Bk. I, ch. 13) of Sextus Empiricus to demonstrate the original distinction between phenomenon and noumenon according to ancient philosophers: νοούμενα φαινομένοις ἀντετίθη Ἀναξαγόρας ('Anaxagoras opposed what is thought to what appears.')