Plans are useless without sufficient power to translate them into action. The mastermind may be defined as coordination of knowledge and effort in the spirit of harmony between two or more people for the attainment of a definite purpose. No two minds ever come together without creating a third invisible force, which may be likened to a third mind. A group of brains coordinated or connected in a spirit of harmony will provide more thought energy than a single brain, just as a group of batteries will provide more energy than a single battery.