"It is perfectly right that you should desire to be rich. If you are a normal man or woman you cannot help doing so.

It is perfectly right that you should give your best attention to the science of getting rich, for it is the noblest and most necessary of all studies. If you neglect this study, you are derelict in your duty to yourself, to God and humanity, for you can render to God and to humanity no greater service than to make the most of yourself."

Wallace D. Wattles in "The Science of Getting Rich"