Our ideas must be as broad as Nature if they are to interpret Nature.

Arthur Conan Doyle

Of all ghosts the ghosts of our old loves are the worst.

Arthur Conan Doyle

I have seen too much not to know that the impression of a woman may be more valuable than the conclusion of an analytical reasoner.

Arthur Conan Doyle

A client is to me a mere unit, a factor in a problem.

Arthur Conan Doyle

From a drop of water a logician could infer the possibility of an Atlantic or a Niagara without having seen or heard of one or the other.

Arthur Conan Doyle

Any truth is better than indefinite doubt.

Arthur Conan Doyle

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

Arthur Conan Doyle

I have frequently gained my first real insight into the character of parents by studying their children.

Arthur Conan Doyle

As a rule, said Holmes, the more bizarre a thing is the less mysterious it proves to be. It is your commonplace, featureless crimes which are really puzzling, just as a commonplace face is the most difficult to identify.

Arthur Conan Doyle

The ideal reasoner, he remarked, would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it.

Arthur Conan Doyle