Date: 1705

"Perhaps what seems to one Black, may seem to another of a different Colour; in short, we cannot absolutely determine whether or no the Eyes are not like Glasses differently cut, which after that manner changes the Colours of Objects."

— Manley, Delarivier (c. 1670-1724)

Date: 1741

"Cornelius quickly discovered, that these two last operations of the intellect were very weak in Martin, and almost totally extinguish'd in Crambe; however he used to say that Rules of Logick are Spectacles to a purblind understanding, and therefore he resolved to proceed with his two Pupils."

— Pope, Alexander (1688-1744); Arbuthnot, John (bap. 1677, d. 1735)