"There is a Brain that will endure but one Scumming; Let the Owner gather it with Discretion and manage his little Stock with Husbandry; but of all things, let him beware of bringing it under the Lash of his Betters; because, That will make it all bubble up into Impertinence, and he will find no new Supply: Wit, without Knowledge, being a Sort of Cream, which gathers in a Sight to the Top, and by a skilful Hand, may be soon whipt into Froth; but once scumm'd away, what appears underneath will be fit for nothing, but to be thrown to the Hogs."
— Swift, Jonathan (1667-1745)
(p. 105, p. 228 in the 1704 edition)
Reading Jonathan Swift, A Tale of a Tub and Other Works, eds. Angus Ross and David Woolley. (Oxford: Oxford University Press, 1986). Some text drawn from ebooks@Adelaide.
Note, the textual history is complicated. First published May 10, 1704. The second edition of 1704 and the fifth of 1710 include new material. Ross and Woolley's text is an eclectic one, based on the three authoritative editions.
See A Tale of a Tub. Written for the Universal Improvement of Mankind. To Which Is Added, an Account of a Battel Between the Antient and Modern Books in St. Jamesâ€™s Library, 2nd edition, corrected (London: Printed for John Nutt, 1704). <Link to ESTC>