Wallace D. Wattles's The Science of Being Great presents a practical philosophy of personal development, teaching that greatness is the result of disciplined thought, purposeful action, and strength of character.

In this influential work of early twentieth-century success philosophy, Wattles explains that individuals become great not by competing with others but by developing their own abilities and directing their efforts toward constructive and creative work. He argues that true success grows from clarity of purpose, confidence, and the consistent application of sound principles.

Wattles encourages readers to cultivate self-control, persistence, and a positive mental outlook. By shaping one's thoughts and actions in harmony with higher ideals, he suggests that individuals can develop their talents and contribute meaningfully to the world around them.

Closely related to Wattles's other influential works, including The Science of Getting Rich and The Science of Being Well, this book forms part of a trilogy that helped shape the philosophy later associated with the New Thought movement and modern personal development literature.