Locke
John Locke claimed that the principles of identity and contradiction were general ideas and only occurred to people after considerable abstract, philosophical thought. He characterized the principle of identity as "Whatsoever is, is." The principle of contradiction was stated as "It is impossible for the same thing to be and not to be." To Locke, these were not innate or a priori principles.
Read more about this topic: Law Of Thought
Famous quotes containing the word locke:
“New opinions are always suspected, and usually opposed, without any other reason but because they are not already common.”
—John Locke (1632–1704)
“Let us then suppose the Mind to be, as we say, white Paper, void of all Characters, without any Ideas; How comes it to be furnished...? To this I answer, in one word, From Experience: In that, all our Knowledge is founded; and from that it ultimately derives it self.”
—John Locke (1632–1704)
“When the spirit brings light into our minds, it dispels darkness. We see it, as we do that of the sun at noon, and need not the twilight of reason to show it us. This light from heaven is strong, clear, and pure carries its own demonstration with it; and we may as naturally take a glow-worm to assist us to discover the sun, as to examine the celestial ray by our dim candle, reason.”
—John Locke (1632–1704)