- Pauline Stacey: There is no mystery to machinery as long as somebody takes the time to understand it.
- Gerald Lloyd: [to Flambeau] The difference, my dear sir, is that machinery is a sign of strength. To wear glasses means, of course, that one is a weakling.
- Hercule Flambeau: [Referring to Kalon] He's a fraud. Don't you agree?
- Father Brown: I'm not sure. He drinks wine, claret by the look of it, and by the expression on his face that's a Mouton-Rothschild.
- [laughs]
- Father Brown: No, a man who likes wine is either sincere or a very serious criminal indeed.
- Father Brown: [to Flambeau] That's the trouble with you agnostics. You think only of things physical. It must be rather monotonous.
- Kalon: Your church and mine are the only true realities on Earth. I worship the Sun and you the darkening of the Sun. You are the priest of the dying; I of the Living God.
- Father Brown: Hmmm. You know, if I believed you to be a sincere man, Mr. Kalon, I'd suggest you're suffering from spiritual sunstroke.
- Father Brown: I know the name of the murderer, but without proof such knowledge is as useless as a rosary in the hands of an atheist.