In the association of ideas "unnatural connections become by custom as natural to the mind, as sun and light"
Of the Conduct of the Understanding
15 entries in ESTC (1706, 1741, 1753, 1754, 1762, 1763, 1781, 1782, 1793, 1794, 1795, 1798, 1800).<br>
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See John Locke, <u>Posthumous Works of John Locke</u> (London: Printed by W.B. for A. and J. Churchill, 1706). &lt;<a href="http://estc.bl.uk/T148785">Link to ESTC</a>&gt;&lt;<a href="http://books.google.com/books?id=o0EVAAAAQAAJ">Link to Google Books</a>&gt;<br>
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Text from <u>Some Thoughts Concerning Education and Of the Conduct of the Understanding</u>, eds. Ruth W. Grant and Nathan Tarcov (Indianapolis: Hackett Publishing Company, 1996).