Man is only a subject full of error, natural and ineffaceable, without grace. Nothing shows him the truth. Everything deceives him. These two sources of truth, reason and the senses, besides being both wanting in sincerity, deceive each other in turn. The senses mislead the Reason with false appearances, and receive from Reason in their turn the same trickery which they apply to her; Reason has her revenge. The passions of the soul trouble the senses, and make false impressions upon them. They rival each other in falsehood and deception. But besides those errors which arise accidentally and through lack of intelligence, with these heterogeneous faculties... The imagination enlarges little objects so as to fill our souls with a fantastic estimate; and, with rash insolence, it belittles the great to its own measure, as when talking of God. Things which have most hold on us, as the concealment of our few possessions, are often a mere nothing. It is a nothing which our imagination magnifies into a mountain. Another turn of the imagination would make us discover this without difficulty.
Blaise Pascal, in 'Pensees'