You need not hesitate to say aloud that my adversary is wrong and that he is an imbecile.

[Vous ne devez pas hésiter à dire hautement que mon adversaire a tort et que c’est un imbécile.]

Claude Bernard (1813-1878) French physiologist, scientist
Cahier de Notes (1860) [tr. Hoff / Guillemin / Guillemin (1967)]
    (Source)

(Source (French))