'The ONE Thing: The Surprisingly Simple Truth Behind Extraordinary Results,' by Gary Keller

Amazon description:

"People are using this simple, powerful concept to focus on what matters most in their personal and work lives. Companies are helping their employees be more productive with study groups, training, and coaching. Sales teams are boosting sales. Churches are conducting classes and recommending for their members. By focusing their energy on one thing at a time people are living more rewarding lives by building their careers, strengthening their finances, losing weight and getting in shape, deepening their faith, and nurturing stronger marriages and personal relationships."

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