" Back of all ideas is Specialized knowledge. Unfortunately for those who do not find riches in abundance, specialized knowledge is more abundant and more easily acquired than ideas. Because of this very truth, there is a universal demand and an ever-increasing opportunity for the person capable of helping men and women to sell their personal services advantageou ...sly. Capability means imagination, the one quality needed to combine specialized knowledge with ideas, in the form organized plans designed to yield riches. "

- Napoleon Hill ( Think & Grow RICH )