Everything comes in circles. [...] The old wheel turns, and the same spoke comes up. It's all been done before, and will be again.
Violence recoils on the violent.
Life is infinitely stranger than anything which the mind of man could invent.
There is a mystery about this which stimulates the imagination; where there is no imagination there is no horror.
If you had killed Watson, you would not have got out of this room alive.
It is decreed by a merciful Nature that the human brain cannot think of two things simultaneously . . .