In this sweeping survey the author traces the Church's history, from her Old Testament roots through her formal establishment under the New Covenant and from the formative period of the Great Councils to her current standing among the many Christian confessions that have emerged since then. In his enduring devotion to the Orthodox understanding of the work of Christ and the Holy Spirit as "the two hands of the Father," Bobrinskoy brings his considerable knowledge and experience to bear in expressing and witnessing to the One, Holy, Catholic and Apostolic Church as the instrument of God's saving grace for all mankind.