Can today's Christians reconcile a belief in self-actualization with the extreme ethical demands of the New Testament? The author argues that they can, although not easily, and that the felt uneasiness between two concerns—self-fulfillment and self-gift—may generate a healthy tension. There is then an apparent mismatch between two views of ethics. On the one hand, psychological humanism is based on self-affirmation, acceptance of one's limitations, moderation, and the search for a quality of life in the midst of globalization. On the other hand, the radicalism of the gospel emphasizes passion (in the two senses of this word), self-transcendence towards the infinite, and generosity for God and others. Nonetheless, these two tendencies are neither incompatible nor easily reconcilable. The book uncovers both the pitfalls of self-actualization and the misleading interpretations that have disfigured the radical gospel. It highlights the developmental factors, views of human life, successes, and failures which play a considerable role in a person's journey. It brings psychological, biblical, philosophical, theological, and pastoral clarifications to bear on the issues. This book will help its readers to grasp what a psychologically informed Christian ethic can be, both intellectually and practically.