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.René Descartes
The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.René Descartes
The first precept was never to accept a thing as true until I knew it as such without a single doubt.René Descartes
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.René Descartes
Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.René Descartes
It is only prudent never to place complete confidence in that by which we have even once been deceived.René Descartes
When it is not in our power to follow what is true, we ought to follow what is most probable.René Descartes
