“They're dangerous at both ends...and crafty in the middle.”

“There is danger for him who taketh the tiger cub, and danger also for whoso snatches a delusion from a woman.”

“A dog reflects the family life. Whoever saw a frisky dog in a gloomy family, or a sad dog in a happy one? Snarling people have snarling dogs, dangerous people have dangerous ones.”

“It is stupidity rather than courage to refuse to recognize danger when it is close upon you.”

“There is a danger there - a very real danger to humanity. Consider, Watson, that the material, the sensual, the worldly would all prolong their worthless lives. The spiritual would not avoid the call to something higher. It would be the survival of the least fit. What sort of cesspool may not our poor world become?”

“I wanted to end the world, but I'll settle for ending yours.”

“He has a gentle voice and a quiet manner, but behind his twinkling blue eyes there lurks a capacity for furious wrath and implacable resolution, the more dangerous because they are held in leash.”