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)