Wallace D. Wattles's The Science of Being Great explores the principles of personal development, character, and purposeful living within the tradition of early twentieth-century success philosophy.

In this influential work, Wattles argues that true greatness arises from the development of character, clear thinking, and constructive action. Rather than focusing solely on material success, he emphasizes the cultivation of mental discipline, ethical conduct, and a strong sense of purpose as the foundations of a meaningful life.

Wattles explains that individuals grow by consciously directing their thoughts and actions toward higher goals. Through persistent effort, clarity of vision, and a commitment to personal improvement, he suggests that people can develop their abilities and realize their full potential.

Part of Wattles's series of influential works on success and personal development, The Science of Being Great complements his better-known books The Science of Getting Rich and The Science of Being Well. Together these works helped shape the philosophy that later became widely associated with the New Thought movement and modern success literature.