Date: 1708, 1714

"The Human Mind and Body are both of 'em naturally subject to Commotions: and as there are strange Ferments in the Blood, which in many Bodys occasion an extraordinary discharge; so in Reason too, there are heterogeneous Particles which must be thrown off by Fermentation."

— Cooper, Anthony Ashley, third earl of Shaftesbury (1671-1713)

Date: 1708, 1714

"For besides that our Reason, which knows the Cheat, will never rest thorowly satisfy'd on such a Bottom, but turn us often a-drift, and toss us in a Sea of Doubt and Perplexity."

— Cooper, Anthony Ashley, third earl of Shaftesbury (1671-1713)

Date: 1710, 1714

"And the prince of this latter tribe may be proved to have been a great frequenter of the wood and river banks, where he consumed abundance of his breath, suffered his fancy to evaporate, and reduced the vehemence both of his spirit and voice."

— Cooper, Anthony Ashley, third earl of Shaftesbury (1671-1713)

Date: February 1792

"It appears as if the tide of mental faculties flowed as far as it could in certain channels, and then forsook its course, and arose in others. How irrational then is the hereditary system, which establishes channels of power, in company with which wisdom refuses to flow!"

— Paine, Thomas (1737-1809)

Date: 1793

"The most palpable of all classes of knowledge is that I am, personally considered, but an atom in the ocean of mind."

— Godwin, William (1756-1836)

Date: 1794

"As those which contribute to circulate the blood, and to perform the various secretions; as well as the associate tribes and trains of ideas, which contribute to furnish the perpetual streams of our dreaming imaginations."

— Darwin, Erasmus (1731-1802)