Volume one contains books I and II of Locke’s essay. In book I, Locke directly attacks the theory of innate knowledge held by Descartes and other continental rationalists. He argued that, at conception, the human mind was a blank slate (tabula rasa). All the ideas and principles in the mind were created by each person’s experience of the world. Descartes and the other continental rationalists held that knowledge could be reached through pure reason, apart from experience, because the human mind had innate principles—ideas and concepts that were there from birth.
In book II, Locke puts forward his theory of ideas. He argues that all ideas come from two different types of experience: sensation and reflection. He distinguishes between simple ideas (red, round) and complex ideas (apple). He also distinguishes between primary and secondary qualities. A primary quality is something which is actually attributable to a thing (solidity) and a secondary quality is a quality which the particular thing produces in the human observer (such as smell). Locke uses his understanding of simple and complex ideas to form an argument for the existence of God.
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