Date: 1641

"I am not that structure of limbs which is called a human body. I am not even some thin vapour which permeates the limbs - a wind, fire, air, breath, or whatever I depict in my imagination; for these are things which I have supposed to be nothing."

— Descartes, René (1596-1650)

Date: 1641

"And whenever my preconceived belief in the supreme power of God comes to mind, I cannot but admit that it would be easy for him, if he so desired, to bring it about that I go wrong even in those matters which I think I see utterly clearly with my mind's eye."

— Descartes, René (1596-1650)

Date: 1641

"Now if we are to become aware of something, it is necessary for the thing to act on the cognitive faculty by transmitting its semblance to the faculty or by informing the faculty with its semblance. Hence it seems clear that the faculty itself, not being outside itself, cannot transmit a semblan...

— Gassendi, Pierre (1592-1655)

Date: 1644, 1647

A 'clear' perception is analogous to an object "present to the eye's gaze" that "stimulates it with a sufficient degree of strength and accessibility"

— Descartes, René (1596-1650)

Date: 1665

"In the human heart new passions are for ever being born; the overthrow of one almost always means the rise of another."

— La Rochefoucauld, François, duc de (1613-1680)

Date: 1665

"Condemned men sometimes affect a steadfastness and indifference to death which is really only fear of looking death in the face; thus it can be said that this steadfastness and indifference do for their spirit what the bandage does for their eyes."

— La Rochefoucauld, François, duc de (1613-1680)

Date: 1665

"The sicknesses of the soul have their ups and downs like those of the body; what we take to be a cure is most often merely a respite or change of disease."

— La Rochefoucauld, François, duc de (1613-1680)

Date: 1665

"Defects in the soul are like wounds in the body: whatever care is taken to heal them the scars always show"

— La Rochefoucauld, François, duc de (1613-1680)

Date: 1665

"Youth is one long intoxication; it is reason in a fever."

— La Rochefoucauld, François, duc de (1613-1680)

Date: w. 1628, published in 1684, 1701

"The writers displayed many geometrical truths before my very eyes, as it were, and derived them by means of logical arguments"

— Descartes, René (1596-1650)