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: 1690, 1694, 1695, 1700, 1706

"GOD I own cannot be denied to enlighten the Understanding by a Ray darted into the Mind immediately from the Fountain of Light"

— Locke, John (1632-1704)

Date: 1691

"As the Eyes are the Windows to let in the Species of all exterior Objects into the dark Cels of the Brain, for the information of the Soul; so are they flaming Torches to reveal to those abroad how the Soul within is moved or affected."

— Ray [formerly Wray], John (1627–1705)

Date: April 26, 1695; 1708

"Meditating by one's self is like digging in the Mine; it often, perhaps, brings up maiden Earth, which never came near the Light before; but whether it contain any Metal in it, is never so well tried as in Conversation with a knowing judicious Friend, who carries about him the true Touch-stone, ...

— Locke, John (1632-1704)

Date: 1759

"The violent emotions which at that time agitate us, discolour our views of things, even when we are endeavouring to place ourselves in the situation of another, and to regard the objects that interest us, in the light which they will naturally appear to him. The fury of our own passions constant...

— Smith, Adam (1723-1790)

Date: 1759

"His mighty mind travelled round the intellectual world; and, with a more than eagle's eye, saw, and has pointed out blank spaces, or dark spots in it, on which the human mind never shone."

— Young, Edward (bap. 1683, d. 1765)

Date: 1793

"It is curious to observe the first dawn of genius breaking on the mind. Sometimes a man of genius, in his first effusions, is so far from revealing his future powers, that, on the contrary, no reasonable hope can be formed of his success."

— Disraeli, Isaac (1766-1848)