Date: 1651, 1668

"And on the contrary, metaphors, and senseless and ambiguous words, are like ignes fatui; and reasoning upon them is wandering amongst innumerable absurdities; and their end, contention and sedition, or contempt."

— Hobbes, Thomas (1588-1679)

Date: 1711

"And reflecting on what is transacted within us, it seems to me a very diverting Scene to think when we strive to recollect something that does not then occur; how nimbly those volatil Messengers of ours will beat through all the Paths, and hunt every Enclosure of the Organ set aside for thinking...

— Mandeville, Bernard (bap. 1670, d. 1733)

Date: 1748, 1749

"The human body is a machine that winds up its own springs: it is a living image of the perpetual motion."

— Julien Offray de La Mettrie (1709-1751)

Date: 1748, 1749

"Like that bird on yonder spray, the imagination seems to be perpetually ready to take wing."

— Julien Offray de La Mettrie (1709-1751)

Date: 1748, 1749

"As the string of a violin or harpsichord trembles and vibrates, so the fibres or strings of the brain struck by the undulating rays of sound, are excited to return or repeat the words that touched them."

— Julien Offray de La Mettrie (1709-1751)