Orthodoxy claims to be universal. Since its first publication fifty years ago, Timothy Ware's book has established itself as the standard introduction to the Orthodox Church in the English-speaking world. Orthodoxy remains a topic of enormous interest among Western Christians, and the author believes that understanding its viewpoints is essential before the Roman Catholic and Protestant churches can be reunited. In this revised and updated edition, he explains the Orthodox views on a wide range of topics, including ecumenical councils, sacraments, free will, purgatory, the papacy, and the relationship between the various Orthodox churches.