Called to Communion: understanding the church today is a precious gift of wisdom. it explains how providential are the trials through which the Catholic church is now passing. The need of the Papal primacy to ensure Christian unity: the true meaning of priesthood as a sacrament and not a mere ministry: the necessity of the Eucharist as the sacrifice of the saviour now offering himself on our alters: the role of the Bishops as successors of the apostles, united with successors of St. Peter, the Bishop of Rome.