Date: 1690, 1694, 1695, 1700, 1706

"The Understanding seems to me, not to have the least glimmering of any Ideas, which it doth not receive from one of these two: Eternal Objects furnish the Mind with the Ideas of sensible qualities, which are all those different perceptions they produced in us: And the Mind furnishes the Understa...

— Locke, John (1632-1704)

Date: 1690, 1694, 1695, 1700, 1706

Internal and external sensation, "These alone, as far as I can discover, are the windows by which light is let into this dark room: For methinks the understanding is not much unlike a closet wholly shut from light, with only some little openings left, to let in external visible resemblances, or i...

— Locke, John (1632-1704)

Date: 1690, 1694, 1695, 1700, 1706

"In all these cases, Ideas in the Mind, quickly fade, and often vanish quite out of the Understanding, leaving no more footsteps or remaining Characters of themselves, than Shadows do flying over fields of Corn; and the Mind is as void of them, as if they never had been there."

— Locke, John (1632-1704)

Date: 1695

"He that made use of the candle of the Lord, so far as to find what was his duty, could not miss to find also the way to reconciliation and forgiveness, when he failed of his duty: though, if he used not his reason this way, if he put out or neglected this light, he might, perhaps see neither."

— Locke, John (1632-1704)

Date: 1706

"Every one declares against blindness, and yet who almost is not fond of that which dims his sight, and keeps the clear light out of his mind, which should lead him into truth and knowledge?"

— Locke, John (1632-1704)

Date: 1706

In the association of ideas "unnatural connections become by custom as natural to the mind, as sun and light"

— Locke, John (1632-1704)

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)