"Who is there almost whose mind, at some time or other, love or anger, fear or grief, has not so fastened to some clog, that it could not turn itself to any other object? I call it a clog, for it hangs upon the mind so as to hinder its vigour and activity in the pursuit of other contemplations, and advances itself little or not [at] all in the knowledge of the thing which it so closely hugs and constantly pores on."
— Locke, John (1632-1704)
See John Locke, Posthumous Works of John Locke (London: Printed by W.B. for A. and J. Churchill, 1706). <Link to ESTC><Link to Google Books>
Text from Some Thoughts Concerning Education and Of the Conduct of the Understanding, eds. Ruth W. Grant and Nathan Tarcov (Indianapolis: Hackett Publishing Company, 1996).