"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, which is Love of Truth in a clear-thinking Head."
Letter to William Molyneux (April 26, 1695) [from Some Familiar Letters]
3 entries in ESTC for uniform title <u>Some Familiar Letters Between Mr. Locke and Several of His Friends</u> (1708, 1737, 1742).<br>
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Text from <u>Familiar Letters Between Mr. John Locke, and Several of His Friends. In Which Are Explain'd, His Notions in His Essay Concerning Human Understanding, and in Some of His Other Works</u>, 4th ed. (London: Printed for F. Noble; T. Wright; and J. Duncan, 1742). &lt;<a href="http://estc.bl.uk/T130566">Link to ESTC</a>&gt;&lt;<a href="books.google.com/books?id=-004AAAAMAAJ">Link to Google Books</a>&gt;. ESTC note: "A reissue of the 1737 Bettesworth and Hitch edition, with the addition of the 'life', and a cancel titlepage."<br>
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See also <u>Some Familiar Letters Between Mr. Locke, and Several of His Friends.</u> (London: Printed for A. and J. Churchill at the Black Swan in Pater-Noster Row, 1708). &lt;<a href="http://estc.bl.uk/T117287">Link to ESTC</a>&gt;&lt;<a href="books.google.com/books?id=gzIVAAAAQAAJ">Link to Google Books</a>&gt;