The lowest and vilest alleys in London do not present a more dreadful record of sin than does the smiling and… — Arthur Conan Doyle

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.

Violence does, in truth, recoil upon the violent, and the schemer falls into the pit which he digs for another.

It is not so impossible, however, that a man should possess all knowledge which is likely to be useful to him in his work, and this, I have endeavoured in my case to do.