““I suppose therefore that all things I see are illusions; I believe that nothing has ever existed of everything my lying memory tells me. I think I have no senses. I believe that body, shape, extension, motion, location are functions. What is there then that can be taken as true? Perhaps only this one thing, that nothing at all is certain ... But I cannot forget that, at other times I have been deceived in sleep by similar illusions; and, attentively considering those cases, I perceive so clearly that there exist no certain marks by which the state of waking can ever be distinguished from sleep, that I feel greatly astonished; and in amazement I almost persuade myself that I am now dreaming ... I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake ... There is nothing more ancient than the truth.””
![“[About Pierre de Fermat] It cannot be denied that he has had many exceptional ideas, and that he is a highly intelligent man. For my part, however, I have always been taught to take a broad overview of things, in order to be able to deduce from them general rules, which might be applicable…” quote by Rene Descartes](https://sms4smile.com/quotes/img-quotes/588/ren-descartes-1376_able_about-pierre-de-fermat-it-cannot-be-deni_89929.jpg)
![“And what more am I? I look for aid to the imagination. [But how mistakenly!] I am not that assemblage of limbs we call the human body; I am not a subtle penetrating air distributed throughout all these members; I am not a wind, a fire, a vapor, a breath or anything at all that I can image. I am…” quote by René Descartes](https://sms4smile.com/quotes/img-quotes/207/ren-descartes-1376_human-body_and-what-more-am-i-i-look-for-aid-to-the_115493.jpg)
