Mistresses are like books; if you pore upon them too much, they doze you and make you unfit for company; but if used discreetly, you are the fitter for conversation by 'em.
Source: Harcourt, in The Country Wife, act 1.
-- William Wycherley, ( 1640-1716), English dramatist, poet; His works include Love In A Wood; Or, St James's Park 1672 and The Country Wife, 1675.