It was not until the seventeenth century that philosophers tried to incorporate new ideas into a clear philosophical system, and the first man to do so was Descrates. His work was a pioneer of the most important problems of philosophy in successive generations. His primary concern is what we may know, in other words, reliable knowledge. Pilot you don’t stop flying when you get old poster. Another big question that haunted him was about the relationship between body and mind. Both questions are at the heart of philosophical arguments for the next 150 years. He must be ahead of his time.