“I think; therefore I am.”

“One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.”

“Travelling is almost like talking with those of other centuries.”

“although we very clearly see the sun, we ought not therefore to determine that it is only of the size which our sense of sight presents; and we may very distinctly imagine the head of a lion...”

“And in this it is not likely that all are mistaken the conviction is rather to be held as testifying that the power of judging aright and of distinguishing truth from error, which is properl...”