It is a pity he did not write in pencil. As you have no doubt frequently observed, the impression usually goes through -- a fact which has dissolved many a happy marriage.

There is nothing more deceptive than an obvious fact.

Circumstantial evidence is a very tricky thing. It may seem to point very straight to one thing, but if you shift your own point of view a little, you may find it pointing in an equally uncompromising manner to something entirely different

All my instincts are one way, and all the facts are the other, and I much fear that British juries have not yet attained that pitch of intelligence when they will give the preference to my theories over Lestrade's facts.