I never guess. It is a shocking habit destructive to the logical faculty.

The less experienced a doctor is, the higher are his notions of professional dignity . . .

I had ... come to an entirely erroneous conclusion, which shows, my dear Watson, how dangerous it always is to reason from insufficient data.

It is quite a three-pipe problem.

As a rule, the more bizarre a thing is, the less mysterious it proves to be.

It is of the highest importance in the art of detection to be able to recognise out of a number of facts which are incidental and which are vital.

The more outre' and grotesque an incident is the more carefully it deserves to be examined, and the very point which appears to complicate a case is, when duly considered and scientifically handled, the one which is most likely to elucidate it.