Simple!" I ejaculated.
"Well, really, it can hardly be described as otherwise," said Sherlock Holmes, smiling at my surprise. "The proof of its intrinsic simplicity is, that without any help save a few very ordinary deductions I was able to lay my hand upon the criminal within three days."
"That is true," said I.
"I have already explained to you that what is out of the common is usually a guide rather than a hindrance. In solving a problem of this sort, the grand thing is to be able to reason backward. That is a very useful accomplishment, and a very easy one, but people do not practise it much. In the everyday affairs of life it is more useful to reason forward, and so the other comes to be neglected. There are fifty who can reason synthetically for one who can reason analytically."
"I confess," said I, that I do not quite follow you."