Sir Arthur Ignatius Conan Doyle KStJ, DL (May 22, 1859 – July 7, 1930) was a Scottish writer and physician, most noted for his fictional stories about the detective Sherlock Holmes, which are generally considered milestones in the field of crime fiction. He is also known for writing the fictional adventures of a second character he invented, Professor Challenger, and for popularising the mystery of the Mary Celeste. He was a prolific writer whose other works include fantasy and science fiction stories, plays, romances, poetry, non-fiction and historical novels. (Click here for full Wikipedia article)
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.
Any truth is better than indefinite doubt.
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.
Evil indeed is the man who has not one woman to mourn him.
For strange effects and extraordinary combinations we must go to life itself, which is always far more daring than any effort of the imagination.
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.
I have frequently gained my first real insight into the character of parents by studying their children.
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.
It has long been an axiom of mine that the little things are infinitely the most important.
It is a capital mistake to theorize before one has data.
Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.
My mind rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram, or the most intricate analysis, and I am in my own proper atmosphere. But I abhor the dull routine of existence. I crave for mental exaltation.
Of all ghosts the ghosts of our old loves are the worst.
Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.
Some facts should be suppressed, or, at least, a just sense of proportion should be observed in treating them.
The most difficult crime to track is the one which is purposeless.
There is nothing more deceptive than an obvious fact.
Violence does, in truth, recoil upon the violent, and the schemer falls into the pit which he digs for another.
We can't command our love, but we can our actions.
Where there is no imagination there is no horror.