Stephen R. Covey's book, The 7 Habits of Highly Effective People. The excerpt focuses on Covey's principle-centered paradigm, which posits that lasting success and happiness are not achieved through superficial tactics but through the internalization of correct principles. These principles are grounded in natural laws that govern human effectiveness, and they guide individuals to make a "paradigm shift" towards a more principle-centered way of life. The text also explores various aspects of Covey's paradigm, such as proactivity, win-win thinking, empathic listening, and synergy, and offers practical steps for readers to implement these principles in their own lives.