You have to pay the price

     "He's waiting on me," Flint said roughly. "You take your turn."

    "The young man turned like a cat. "Why, you - !"

    The sentence was never completed. Jim Flint, far from the marts of capital and bonds, struck viciously. The young man had started to move in, and the punch caught him flush on his completely unprotected chin. He hit the floor on his face, as if struck with a mallet.

    Jim Flint looked across the fallen man at the three who were with him. "He was hunting trouble. He found it. There's more if you want to buy."

    The other youngster started to speak, but the older, neatly dressed man interrupted. "You're quick," he said, "and you hit hard. How are you with a gun?"

    Flint looked across the room and said coolly, "As you see, I am wearing one. If you wish to know how good I am with it, you will have to pay to learn."

(from Flint, by Louis L'Amour)