Wonder is the first of all the passions.

If ... it is not in my power to arrive at the knowledge of any truth, I may at least do what is in my power, namely, suspend judgement.

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

Instead I ought to be grateful to Him who never owed me anything for having been so generous to me, rather than think that He deprived me of those things or has taken away from me whatever He did not give me.

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

All is to be doubted.

How do we know that anything really exists, that anything is really the way it seems ot us through our senses?