Bueno es saber algo de las costumbres de otros pueblos, para juzgar las del propio con mejor acierto, y no creer que todo lo que sea contrario a nues… - René Descartes

I was aware that the reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of thoughts.

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.

«Y no me precio tampoco de ser el primer inventor de mis opiniones, sino solamente de no haberlas admitido ni porque las dijeran otros ni porque no las dijeran, sino sólo porque la razón me convenció de su verdad.»