Selfhood mastery is the ultimate perfection of Inner Strength and the ultimate achievement of Inner Peace. The purpose of this book is to serve as a guide for creating, enhancing, and maintaining the Inner Strength and Inner Peace that leads to happiness. To this end, methods are given for developing Rational Thinking skills and Common Sense. Both guide one into gathering right information, into displaying Mental Toughness, into designing wise choices, decisions, and solutions, and into fashioning a foundation for and patterns connected to inner and outer success.