Madam, before you flatter a man so grossly to his face, you should consider whether or not your flattery is worth his having.
Source: Diary and Letters, (Mme D'Arblay), Vol. I, Ch. 2
-- Samuel Johnson, (Sep 18 1709-1784), English lexicographer, critic; He was remembered for writing the first critique of Shakespeare, 1765 and Dictionary of the English Language, 1755.