As in smooth oil the razor best is whet, So wit is by politeness sharpest set; Their want of edge from their offence is seen, Both pain us least when exquisitely keen.
Edward Young, John Doran, James Nichols (1854). “The Complete Works, Poetry and Prose of the Rev. Edward Young, LL.D.: Revised and Collated with the Earliest Editions. To which is Prefixed A Life of the Author”, p.358
