YOU, DON’T KNOW, WHAT YOU DON’T KNOW. JOIN A POWERFUL MASTERMIND! Napoleon Hill (Author, “Think & Grow Rich”) wrote about the mastermind group principle as: “The coordination of knowledge and effort of two or more people, who work toward a definite purpose, in the spirit of harmony.” He continues… “No two minds ever come together without thereby creating a third, invisible intangible force, which may be likened to a third mind [the master mind].”