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

If I simply refrain from making a judgment in cases where I do not perceive the truth with sufficient clarity and distinctness, then it is clear that I am behaving correctly and avoiding error.

He lives well who is well hidden.

There is a little gland in the brain in which the soul exercises its functions in a more particular way than in the other parts.

Now therefore, that my mind is free from all cares, and that I have obtained for myself assured leisure in peaceful solitude, I shall apply myself seriously and freely to the general destruction of all my former opinions.

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.

Divide each difficulty at hand into as many pieces as possible and as could be required to better solve them.