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Madam, before you flatter a man so grossly to his face, you should consider whether or not your flattery is worth his having.

Remark to Hannah More, in 'Diary and Letters of Madame D'Arblay' [Fanny Burney] (1842) vol. 1, pt. 2, p. 55 (August 1778)
Madam, before you flatter a man so grossly to his face, you should consider whether or not your flattery is worth his having.