Perhaps, when a man has special knowledge and special powers like my own, it rather encourages him to seek a complex explanation when a simpler one is at hand.

It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

It seems to leave the darkness rather blacker than before.

The lowest and vilest alleys of London do not present a more dreadful record of sin than does the smiling and beautiful countryside.

Detection is, or ought to be, an exact science, and should be treated in the same cold and unemotional manner.

It’s every man’s business to see justice done.

I know, my dear Watson, that you share my love of all that is bizarre and outside the conventions and humdrum routine of daily life.