Each problem that I solved became a rule, which served afterwards to solve other problems.

The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.

The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.

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.