We are prepared to go to the gates of Hell—but no further.
Nous voulons bien aller jusqu'aux portes de l'enfer; mais nous entendons neus arrêter là.
Original text (French)
Source, in full
On his initially cautious approach in dealing with Napoleon, c. 1800–1. Quoted by Cardinal Ercole Consalvi in his memoirs, written originally in Italian; published in French, Mémoires (2nd ed., 1866), vol. 1, p. 365, note; translated into English by J. M. Robinson, Cardinal Consalvi (1981)