You beat your Pate, and fancy Wit will come:
Knock as you please, there's no body at home.
Source: Another Epigram, in Miscellanies, vol. 3 (1732).
-- Alexander Pope, (May 21 1688-1744), English poet; He is remembered as a major satirist of Augustan age; wrote The Rape of the Lock, 1714 and Moral Essays, 1731-35.