Wallace D. Wattles's The Science of Being Great explores the principles of personal development, character, and purposeful action as part of his influential series of New Thought success writings.

Building upon the ideas presented in his earlier works, Wattles examines how individuals may cultivate greatness not merely through ambition or competition, but through the disciplined development of thought, character, and purposeful effort. He argues that greatness arises from the consistent application of constructive thinking combined with practical action directed toward meaningful goals.

Rather than focusing solely on financial success, Wattles presents greatness as the natural result of personal growth, service, and alignment with universal creative principles. Through clear and direct guidance, he encourages readers to develop confidence, clarity of purpose, and a constructive mental outlook that supports both individual achievement and positive contribution to society.

Written in the early twentieth century, The Science of Being Great remains an enduring work of classic success philosophy. Together with Wattles's related writings, it forms part of a broader New Thought tradition that continues to influence modern discussions of personal development and the power of focused thought.