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Although Berkeley rejected the Lockean notions of primary and secondary qualities and matter, he retained Locke’s belief in the existence of mind, substance, and causation as an unseen force or power in objects. David Hume, in contrast, rejected all these notions. Hume recognized two kinds of perception: “impressions” and “ideas.” Impressions are perceptions that the mind experiences with the “most force and violence,” and ideas are the “faint images” of impressions. Hume considered this distinction so obvious that he demurred from explaining it at any length; as he indicated in a summary explication in A Treatise of Human Nature (1739–40), ...(100 of 23160 words)