“Is he not the celebrated author of The Dynamics of an Asteroid, a book which ascends to such rarefied heights of pure mathematics that it is said that there was no man in the scientific press capable of criticizing it?”

“...while the individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty.”

“It is a question of cubic capacity," said he; "a man with so large a brain must have something in it.”

“Well," he said, "I say, now, as I said then, that 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 this library, where he can get it if he wants it.”

“His incredible untidiness, his addiction to music at strange hours, his occasional revolver practice within doors, his weird and often malodorous scientific experiments, and the atmosphere of violence and danger which hung around him made him the very worst tenant in London.”

“The man might have died in a fit; but then the jewels are missing," mused the Inspector, "Ha! I have a theory. These flashes come upon me at times... What do you think of this, Holmes? Sholto was, on his own confession, with his brother last night. The brother died in a fit, on which Sholto walked off the treasure! How's that?""On which the dead man very considerately got up and locked the door on the inside," said Holmes.”

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