I concluded that I might take as a general rule the principle that all things which we very clearly and obviously conceive are true: only observing, however, that there is some difficulty in rightly determining the objects which we distinctly conceive.
Rene Descartes
If you would be
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things. Rene Descartes