The most critical account of the mind-body theory was first systematically carried out by Descartes. ... He was the first to argue that the mind is a non-material entity which is distinct and separate from the brain. ... In his work, Meditations, Descartes began his philosophical journey by finding out the things which he can claim absolute certainty from those which he is doubtful. ... He observed that the truth 'I think therefore I am' was so solid that it become the first principle of philosophy he sought. This expression summarizes Descartes philosophy. ...

• Word Count: 4771
• Approx Pages: 19
• Has Bibliography
• Grade Level: Undergraduate