One should never judge anything unless it is known. - René Descartes

it
would be surprising if I had a clearer grasp of things that I
realize are doubtful, unknown and foreign to me — ·namely,
bodies· — than I have of what is true and known — namely
my own self. But I see what the trouble is: I keep drifting
towards that error because my mind likes to wander freely,
refusing to respect the boundaries that truth lays down. Very
well, then; I shall let it run free for a while, so that when
the time comes to rein it in it won’t be so resistant to being
pulled back.

He cannot be a deceiver, since the light of nature teaches us that fraud and deception necessarily proceed from some defect.

Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.