"“Men may keep a sort of level of good, but no man has ever been able to keep on one level of evil. That road goes dow…"

"“Have you ever noticed this—that people never answer what you say? They answer what you mean—or what they think you m…"

""Reverend sir," cried Angus, standing still, "are you raving mad, or am I?" "You are not mad," said Brown, "only a li…"

"Ten false philosophies will fit the universe; ten false theories will fit Glengyle Castle. But we want the real expla…"

"…Oh, let me be silly a little. You don't know how unhappy I have been. And now I know that there has been no deep sin…"

"You have to know something of the mind as well as the body," answered the priest; "we have to know something of the b…"

"The modern mind always mixes up two different ideas: mystery in the sense of what is marvellous, and mystery in the s…"

"I never said it was always wrong to enter fairyland. I only said it was always dangerous."

"“Humility is the mother of giants. One sees great things from the valley; only small things from the peak.”"

"“But every clever crime is founded ultimately on some one quite simple fact—some fact that is not itself mysterious. …"