“Does it never strike you that doubt can be a madness, as well as faith? That asking questions may be a disease, as well as proclaiming doctrines? You talk of religious mania! Is there no such thing as irreligious mania?”

“What's Optimism?' asked Cacambo. 'I'm afraid to say,' said Candide, 'that it's a mania for insisting that all is well when things are going badly.”

“The attendant thinks it is some form of religious mania which has seized him. If so, we must look for squalls, for a strong man with homicidal and religious mania at once might be dangerous. The combination is a dreadful one.”

“It is, I believe, one of the few dangerous forms of eccentricity, a highly contagious mania, to be precise, of the rampant social variety! In your friend's case, we may not yet be dealing with out-and-out insanity . . . No . . . Maybe his trouble is only exaggerated conviction . . . But the contagious manias are well known to me! . . . I've known a good many sufferers from conviction mania . . . Of many different types . . . And in the last analysis, those who talk about justice seem to be the maddest of the lot! . . . At first, I must confess, I took a certain interest in justice fanatics . . . Today those particular maniacs annoy and exasperate me more than I can tell . . . Don't you feel the same way? . . . Human beings show a strange aptitude for transmitting this mania. It terrifies me, and we find it, mind you, in all human beings!”

“Grandpa Martin Vanderhoff: Penny, why don't you write a play about Ism-Mania?Penny Sycamore: Ism-Mania?Grandpa Martin Vanderhoff: Yeah, sure, you know, Communism, Faschism, Voodoo-ism, everybody's got an -ism these days.Penny Sycamore: Oh[laughs]Penny Sycamore: I thought it was some kind of itch or something.Grandpa Martin Vanderhoff: Well, it's just as catching. When things go a little bad nowadays, you go out, get yourself an -ism and you're in business. ”

“If you were married to a dipsomaniac, would you pretend that the mania for alcohol was perfectly harmless?”