"Je pense, donc je suis" - is this right ? "Je pense, donc je suis" - "Im thinking therefor I am" <Rene Descartes> Is this correct ? Why should I have to think to know that I am ? Is there any good reason to believe that this expression is correct or is just a result of some historical fashion ? It is possible today, to say something like this: "I'm tired of all this thinking but still I believe I am" ? Is this logikal "fundament of all fundaments" for Rene Descates still valid today, or are there other alternative fundaments to relay on ?