LOCKE
PRACTICAL MAN OF THE WORLD
Mind over Matter
WHITE PAPER
Locke asks us to "suppose the mind to be a white paper, void of all characters " and then asks "Whence has it all the materials of reason and knowledge?". The answer - "All that we know comes from sense experience, and from reflection upon experience." Locke differs from the outlook of others in two ways. First he rejects Descartes' concept of innate ideas. We are born ignorant and just as importantly without original sin. Second, he claims that perception involves not two but three things - the observer, the idea and the object. Objects of perception are not things, but "ideas" and perception is a "species of understanding". The perceiver responds not to the object itself, but to ideas, to qualities of the object.
IDEAS
You look at an object. Your senses tell you it has a number of primary qualities inherent in the object - solidity, figure, number. These are what science can accept as having an objective existence. It also has a series of secondary qualities, dependent on the perceiver and factors external to the object. Colour, for instance can appear different in different conditions. The perceiver creates a mental picture which involves a combination of sensory responses and mental comparisons. You know that this is a coin because of the co-existence of ideas you have come through experience to associate with coins. Its roundness, its solidity, these are as much ideas as the value you place on it.