"Reason is, and ought to be, the slave of the Passions"
David Hume
cited by Peter Gay in his article, “The Enlightenment” in Horizon Volume XII Nº2 page 43
cited in turn by Sprezzatura, Jul.15.04
and now, again, here.
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Hume's An Enquiry Concerning Human Understanding
Harvard Classics & Shelf of Fiction
bartleby
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Hume's A Treatise of Human Nature Chapter 63
eBooks@Adelaide: Free Web Books, Online
University of Adelaide Library

"Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them. "