Descartes, regarded as the founder of modern philosophy, gave expression to this primary error with his famous dictum (which he saw as primary truth): “I think, therefore I am.” This was the answer he found to the question “Is there anything I can know with absolute certainty?” He realized that the fact that he was always thinking was beyond doubt, and so he equated thinking with Being, that is to say, identity—I am—with thinking. Instead of the ultimate truth, he had found the root of the ego, but he didn’t know that.
