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 necessary to direct his Voyage, and caution him against running upon Shoals, that may ruin him."

— Locke, John (1632-1704)


Place of Publication
London
Date
1690, 1694, 1695, 1700, 1706
Metaphor
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 necessary to direct his Voyage, and caution him against running upon Shoals, that may ruin him."
Metaphor in Context
When we know our own Strength, we shall the better know what to undertake with hopes of Success: And when we have well survey'd the Powers of our own Minds, and made some Estimate what we may expect from them, we shall not be inclined either to sit still, and not set our Thoughts on work at all, in Despair of knowing anything; nor on the other side question everything, and disclaim all Knowledge, because some Things are not to be understood. '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 necessary to direct his Voyage, and caution him against running upon Shoals, that may ruin him. Our Business here is not to know all things, but those which concern our Conduct. If we can find out those Measures, whereby a rational Creature put in that State, which Man is in, in this World, may, and ought to govern his Opinions, and Actions depending thereon, we need not be troubled, that some other things escape our Knowledge.
(I.i.6)
Provenance
Skimming hard copy and with some pasting from Columbia's ILT digital texts. (6th edition of Essay.)
Citation
Locke began composition as early as 1671 (Drafts A and B).

I find over 25 entries in the ESTC (1690, 1694, 1695, 1700, 1706, 1710, 1715, 1721, 1726, 1731, 1735, 1741, 1748, 1753, 1759, 1760, 1765, 1768, 1775, 1777, 1786, 1788, 1793, 1795, 1796, 1798). See also the many abridgements issued in the period.

First published as An Essay Concerning Humane Understanding. In Four Books. (London: Printed by Eliz. Holt, for Thomas Basset, at the George in Fleetstreet, near St. Dunstan's Church, 1690). <Link to EEBO><EEBO-TCP>

Searching first in a Past Masters edition based on the 12th Edition of Locke's Works and proofread against the 1959 Fraser edition. More recent searches in EEBO-TCP.

Reading John Locke's An Essay Concerning Human Understanding, ed. Peter Nidditch (Oxford, Oxford UP, 1975)--against which I have checked the text searched in Past Masters. Note, Nidditch's text is based on 4th ed. of 1700.
Date of Entry
09/04/2003

The Mind is a Metaphor is authored by Brad Pasanek, Assistant Professor of English, University of Virginia.