René Descartes Quotes
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Thinking is another attribute of the soul; and here I discover what properly belongs to myself. This alone is inseparable from me. I am—I exist: this is certain; but how often? As often as I think; for perhaps it would even happen, if I should wholly cease to think, that I should at the same time altogether cease to be. I now admit nothing that is not necessarily true: I am therefore, precisely speaking, only a thinking thing, that is, a mind, understanding, or reason,—terms whose signification was before unknown to me.
I think, therefore I am.
That the nature of a body does not consist in weight, hardness, color, or other similar properties; but in extension alone. By so doing, we shall perceive that the nature of matter... does not consist in... affects of the senses... but only in the fact that it is a thing possessing extension in length, breadth, and depth.