Date: 1817

Mackintosh, following Hobbes and Hartley, analogizes mind and matter: "the law of association being that to the mind, which gravitation is to matter. "

— Coleridge, Samuel Taylor (1772-1834)

Date: 1817

"Let us cross-examine Hartley's scheme under the guidance of this distinction; and we shall discover, that contemporaneity, (Leibnitz's Lex Continui) is the limit and condition of the laws of mind, itself being rather a law of matter, at least of phaenomena considered as material. At the utmost, ...

— Coleridge, Samuel Taylor (1772-1834)

Date: 1805-6, published 1833-6

"It would make no difference if there had been no Reason there, just as with physicists it is a matter of perfect indifference whether, for instance, there is such a thing as magnetism or not."

— Hegel, G. W. F. (1770-1831)

Date: August 31, 1837

"But he, in his private observatory, cataloguing obscure and nebulous stars of the human mind, which as yet no man has thought of as such, — watching days and months, sometimes, for a few facts; correcting still his old records; — must relinquish display and immediate fame."

— Emerson, Ralph Waldo (1803-1882)

Date: 1841

"It is the solar system of the mind."

— Marx, Karl (1818-1883)