I never guess. It is a shocking habit -- destructive to the logical faculty.
~ Sir Arthur Conan Doyle - [Speculation]

Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.
~ Sir Arthur Conan Doyle - [Talent]

I can never bring you to realize the importance of sleeves, the suggestiveness of thumb-nails, or the great issues that may hang from a boot-lace.
~ Sir Arthur Conan Doyle - [Things and Little Things]

It has long been an axiom of mine that the little things are infinitely the most important.
~ Sir Arthur Conan Doyle - [Things and Little Things]

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.
~ Sir Arthur Conan Doyle - [Truth]

Violence does, in truth, recoil upon the violent, and the schemer falls into the pit which he digs for another.
~ Sir Arthur Conan Doyle - [Violence]

There is nothing more unaesthetic than a policeman.
~ Sir Arthur Conan Doyle - [Police]

When the impossibility has been eliminated, whatever remains, no matter how improbable... is possible.
~ Sir Arthur Conan Doyle - [Possibilities]

Our ideas must be as broad as Nature if they are to interpret Nature.
~ Sir Arthur Conan Doyle - [Science and Scientists]

Depend upon it there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.
~ Sir Arthur Conan Doyle - [Knowledge]

All other men are specialists, but his specialty is omniscience.
~ Sir Arthur Conan Doyle - [Learning]

A man should keep his little brain attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber room of his library, where he can get it if he wants it.
~ Sir Arthur Conan Doyle - [Libraries]

Life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really merely commonplaces of existence. If we could fly out of that window hand in hand, hover over this great city, gently remove the roofs and peep in at the queer things which are going on, the strange coincidences, the planning, the cross-purposes, the wonderful chain of events, working through generations and leading to the most outer results, it would make all fiction with its conventionalities and foreseen conclusions most stale and unprofitable.
~ Sir Arthur Conan Doyle - [Life and Living]

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.
~ Sir Arthur Conan Doyle - [Logic]

I consider that a man's brain originally is like a little empty attic, and you have to stock it with such furniture as you choose.
~ Sir Arthur Conan Doyle - [Mind]

It is a capital mistake to theorize before one has data.
~ Sir Arthur Conan Doyle - [Mistakes]

Some facts should be suppressed, or, at least, a just sense of proportion should be observed in treating them.
~ Sir Arthur Conan Doyle - [Facts]

There is nothing as deceptive as an obvious fact.
~ Sir Arthur Conan Doyle - [Facts]

Where there is no imagination there is no horror.
~ Sir Arthur Conan Doyle - [Horror]

When a doctor does go wrong he is the first of criminals. He has nerve and he has knowledge.
~ Sir Arthur Conan Doyle - [Doctors]