We then saw what St. Jerome said of those who serve God and those who serve the world: "Each to the other we seem insane": Invicem insanire videmur. There is a never-ending duel between the two.
Mémoires pour servir à l'histoire de Port-Royal (1752), as cited by M. A. Screech in Laughter at the Foot of the Cross (1997), p. 69