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

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

It seems very strange ... that in the course of the world's history so obvious an improvement should never have been adopted. ... The next generation of Britishers would be the better for having had this extra hour of daylight in their childhood.

One must wait till it comes.

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?

For the one and only time I caught a glimpse of a great heart as well as of a great brain.

You wish to put me in the dark. I tell you that I will never be put in the dark. You wish to beat me. I tell you that you will never beat me.