If you had killed Watson, you would not have got out of this room alive.

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?

Some facts should be suppressed, or, at least, a just sense of proportion should be observed in treating them.

[Sherlock Holmes:] The temptation to form premature theories upon insufficient data is the bane of our profession.

I could not rest, Watson, I could not sit quiet in my chair, if I thought that such a man as Professor Moriarty were walking the streets of London unchallenged.

No violence, gentlemen — no violence, I beg of you! Consider the furniture!

It is a capital mistake to theorize before you have all the evidence. It biases the judgment.