Some years ago I was struck by the large number of falsehoods that I had accepted as true in my childhood, and by the highly doubtful nature of the whole edifice that I had subsequently based on them. I realized that it was necessary, once in the course of my life, to demolish everything completely and start again right from the foundations if I wanted to establish anything at all in the sciences that was stable and likely to last.
Rene DescartesIt is possible that I am dreaming right now and that all of my perceptions are false.
Rene DescartesFew look for truth; many prowl about for a reputation of profundity by arrogantly challenging whichever arguments are the best.
Rene DescartesAlthough my knowledge grows more and more, nevertheless I do not for that reason believe that it can ever be actually infinite, since it can never reach a point so high that it will be unable to attain any greater increase.
Rene Descartes