There is no scent so pleasant to my nostrils as that faint, subtle reek which comes from an ancient book.

My business is that of every other good citizen - to uphold the law.

Man, or at least criminal man, has lost all enterprise and originality. As to my own little practice, it seems to be degenerating into an agency for recovering lost lead pencils and giving advice to young ladies from boarding-schools.

...Holmes, who loathed every form of society with his whole Bohemian soul, remained in our lodgings in Baker Street, buried among his old books, and alternating from week to week between cocaine and ambition, the drowsiness of the drug, and the fierce energy of his own keen nature.

My sister and I, you will recollect, were twins, and you know how subtle are the links which bind two souls which are so closely allied.

It is a great thing to start life with a small number of really good books which are your very own.

Crime is common. Logic is rare. Therefore it is upon the logic rather than upon the crime that you should dwell.