IS THERE SUCH THING as TRUTH? Descartes got it right! Once in a lifetime we ought to stop and ask ourselves the fundamental questions, who we are, what is the status of our knowledge, can we trust what we think we know. He did it, by going into a cabin in a forest and concentrating on the big questions, and especially on the status of our knowledge. What guarantee do we have that what we think is true is actually true?