Date: 1637

"I kept uprooting from my mind any errors that might previously have slipped into it."

— Descartes, René (1596-1650)

Date: 1637

"Now a painter cannot represent all the different sides of a solid body equally well on his flat canvas, and so he chooses one of the principal ones, sets it facing the light, and shades the others so as to make them stand out only when viewed from the perspective of the chosen side. In just the ...

— Descartes, René (1596-1650)

Date: 1637

"I supposed, too, that in the beginning God did not place in this body any rational soul or any other thing to serve as a vegetative or sensitive soul, but rather that he kindled in its heart one of those fires without light which I had already explained, and whose nature I understood to be no di...

— Descartes, René (1596-1650)

Date: 1755

"The sovereign power represents the head; the laws and customs are the brain, the source of the nerves and seat of the understanding, will and senses, of which the Judges and Magistrates are the organs: commerce, industry, and agriculture are the mouth and stomach which prepare the common subsist...

— Rousseau, Jean-Jacques (1712-1778)