"How do you know that?" "I followed you." "I saw no one." "That is what you may expect to see when I follow you." - Arthur Conan Doyle

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?

Every man finds his limitations, Mr. Holmes, but at least it cures us of the weakness of self-satisfaction.

"I find it hard enough to tackle facts, Holmes, without flying away after theories and fancies."

"You are right," said Holmes demurely: "you do find it very hard to tackle the facts."