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Some philosophers before Locke had suggested that it would be good to find the limits of the Understanding, but what Locke does is to carry out this project in detail. In the four books of the Essay Locke considers the sources and nature of human knowledge. Book I argues that we have no innate knowledge. (In this he resembles Berkeley and Hume, and differs from Descartes and Leibniz.) So, at birth, the human mind is a sort of blank slate on which experience writes. In Book II Locke claims that ideas are the materials of knowledge and all ideas come from experience. The term 'idea,' Locke tells us "…stands for whatsoever is the Object of the Understanding, when a man thinks" (Essay I, 1, 8, p. 47). Experience is of two kinds, sensation and reflection. One of these - sensation - tells us about things and processes in the external world. The other - reflection - tells us about the operations of our own minds. Reflection is a sort of internal sense that makes us conscious of the mental processes we are engaged in. Some ideas we get only from sensation, some only from reflection and some from both.

"Descartes's Arguments for Universal Doubt and the "Cogito" Argument (An Outline of Meditations 1,2) The argument for universal doubt: A. The dream argument: 1. I often have perceptions very much like the ones I usually have in sensation while I am dreaming. 2. There are no definite signs to distinguish dream experience from waking experience. therefore,"