Date: 1654

"We often see stones hang with drops not from any innate moisture, but from a thick air about them; so may we sometime see marble-hearted sinners seem full of contrition, but it is not from any dew of grace within but from some black clouds that impends them, which produces these sweating effects."

— Bradstreet, Anne (1612-1672)

Date: 1684

"For certainly there must be some change in our mind when we have some thoughts and then others, and, in fact, ideas of things we are not actually thinking about are in our minds as the shape of Hercules is in rough marble."

— Leibniz, Gottfried Wilhelm (1646-1716)