"'Remember,' concluded he, 'that the solitary mortal is certainly luxurious, probably superstitious, and possibly mad: the mind stagnates for want of employment, grows morbid, and is extinguished like a candle in foul air.'"
Anecdotes of the Late Samuel Johnson 
5 entries (1786).<br>
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Hester Lynch Piozzi, <u>Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life</u> (London: T. Cadell, 1786). &lt;<a href="http://estc.bl.uk/T99797">Link to ESTC</a>&gt;&lt;<a href="http://books.google.com/books?id=TaUEAAAAYAAJ">Link to Google Books</a>&gt;<br>
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See also <u>Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life</U>. 4th edition. (London: Cadell, 1786). &lt;<a href="http://books.google.com/books?id=F8IIAAAAQAAJ">Link</a>&gt;