The Diva's Ruby by F. Marion Crawford

Without offending Mr. Van Torp, Lady Maud managed not to see him again for some time, and when he understood, as he soon did, that this was her wish, he made no attempt to force himself upon her. She was probably thinking over what he had said, and in the end she would exert her influence as he had begged her to do. He was thoroughly persuaded that there was nothing unfair in his proposal and that, when she was convinced that he was right, she would help him. In a chequered career that had led to vast success, he had known people who called themselves honest and respectable but who had done unpardonable things for a hundredth part of what he offered. Like all real financiers, he knew money as a force, not as a want, very much as any strong working man knows approximately how much he can lift or carry, and reckons with approximate certainty on his average strength.

To speak in his own language, Mr. Van Torp knew about how many horse-power could be got out of any sum of money, from ten cents to more millions than he chose to speak of in his own case.