Variant: When it is not in our power to follow what is true, we ought to follow what is most probable.

Thus each truth discovered was a rule available in the discovery of subsequent ones.

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.

I am thing that thinks: that is, a things that doubts,affirms, denies, understands a few things, is ignorant of many things, is willing, is unwilling, and also which imagines and has sensory perceptions.

The nature of matter, or body considered in general, consists not in its being something which is hard or heavy or coloured, or which affects the senses in any way, but simply in its being something which is extended in length, breadth and depth.

It is not enough to have a good mind. The main thing is to use it well.

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