Date: 1690, 1694, 1695, 1700, 1706

Surveying the "Powers of our own Minds" is like fathoming "the depths of the Ocean": "'Tis of great use to the Sailor to know the length of his Line, though he cannot with it fathom all the depths of the Ocean. 'Tis well he knows, that it is long enough to reach the bottom, at such Places as are ...

— Locke, John (1632-1704)

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: 1738

A person may be called the same person by "a continual Superaddition of the like Consciousness ... Just as a Ship is called the same Ship, after the whole Substance is changed by frequent Repairs; or a River is called the same River, though the Water of it be every Day new."

— Clarke, Samuel (1675-1729)