Calumniate, calumniate; there will always be something which sticks.
Calomniez, calomniez; il en reste toujours quelque chose.
Original text (French)
Notes from Wikiquote
This is the Latin proverb:—"Audacter calumniare; semper aliquid hæret." See: Bacon, De Dignitate et Augmentis Scientiarum, viii, 2 | Caluminate enough, something always sticks. | Ramage (1866) p. 3