So all life is a great chain, the nature of which is known whenever we are shown a link of it.

Now, Watson,” said Holmes, as a tall dog-cart dashed up through the gloom, throwing out two golden tunnels of yellow light from its side lanterns. “You’ll come with me, won’t you?” “If I can be of use.” “Oh, a trusty comrade is always of use; and a chronicler still more so. My room at The Cedars is a double-bedded one.

Education never ends, Watson. It is a series of lessons, with the greatest for the last.

When the impossible has been eliminated, all that remains no matter how improbable is possible.

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

One forms provisional theories and waits for time or fuller knowledge to explode them. A bad habit, Mr. Ferguson, but human nature is weak. Sherlock Holmes speaking with Dr. Watson.

That which is clearly known hath less terror than that which is but hinted at and guessed.