During her lifelong service to the poorest of the poor, Mother Teresa became an icon of compassion to people of all religions; her extraordinary contributions to the care of the sick, the dying, and thousands of others nobody else was prepared to look after have been recognized and acclaimed throughout the world. Little is known, however, about her own spiritual heights or her struggles. This collection of her writings and reflections, almost all of which have never been made public before, sheds light on Mother Teresa's interior life in a way that reveals the depth and intensity of her holiness for the first time.