Detection is, or ought to be, an exact science, and should be treated in the same cold and unemotional manner.

Never trust to general impressions, my boy, but concentrate yourself upon details.

I have my own views about Nature's methods, though I feel that it is rather like a beetle giving his

What the deuce is it to me?" he interrupted impatiently: "you say that we go round the sun. If we went round the moon it would not make a pennyworth of difference to me or to my work.

My life is spent in one long effort to escape from the commonplaces of existence. These little problems help me to do so.

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

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