Which novel did this come from?

This is easy.  From which novel did this conversation take place?  And who were the characters?

  "What good is my life to any one? What will you do with it?"

  "I shall improve it," replied the voice from the darkness. "I shall make it useful. But I shall risk it, too. Perhaps I shall lose it, for I have lost lives, just as I have saved them. This is my promise: life, with enjoyment, with danger, with excitement, and - with money. Life, above all, with honor. If I give it, I demand obedience. Absolute obedience. You may accept my terms, or you may refuse. I shall wait for you to choose."