...down these mean streets a man must go who is not himself mean, who is neither tarnished nor afraid. He is the hero; he is everything. He must be a complete man and a common man and yet an unusual man. He must be, to use a rather weathered phrase, a man of honor - by instinct, by inevitability, without thought of it, and certainly without saying it. He must be the best man in his world and a good enough man for any world.
He will take no man's money dishonestly and no man's insolence without a due and dispassionate revenge. He is a lonely man and his pride is that you will treat him as a proud man or be very sorry your ever saw him.
The story is this man's adventure in search of a hidden truth, and it would be no adventure if it did not happen to a man fit for the adventure. If there were enough like him, the world would be a very safe place to live in, without becoming too dull to be worth living in."
- Raymond Chandler, The Simple Art of Murder