In the matter of a difficult question it is more likely that the truth should have been discovered by the few than by the many.

Intuition is the undoubting conception of a pure and attentive mind, which arises from the light of reason alone, and is more certain than deduction.

The entire method consists in the order and arrangement of the things to which the mind's eye must turn so that we can discover some truth.

It is to the body alone that we should attribute everything that can be observed in us to oppose our reason.

Sensations are nothing but confused modes of thinking.

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

The first precept was never to accept a thing as true until I knew it as such without a single doubt.