Thus, in the case of any diocese, whether that of a simple bishop, or a primate, or a patriarch, the Pope does not hesitate to tell their several diocesans that they are set free from all duty of obedience to one condemned by him. No act can show the superior authority of the universal Primate more strongly than this. St. Gregory the Great had said that all bishops were equal when performing their respective work in their own diocese; but if that work is not duly performed, he knows of no bishop who is not subject to the Apostolic See. The power of the Primacy is essentially for edification of the whole Church, and so is exerted whenever the Church and the faith of the Church are anywhere in danger. The acts of St. Martin I. at a crisis of singular danger follow exactly the rule of St. Gregory. If an emperor supports heresy, he condemns his act, though he may be a lawful sovereign; if a patriarch is false to the faith, he sets a vicar of his own to appoint fresh bishops in the patriarchate. If his own vicar sins against the power which appointed him, he dissolves the primary bond according to which the people of that diocese is bound to their own bishop. But the supreme authority of the Roman See is indicated most plainly in the encyclical letter issued by the Pope. It is addressed(42) “Martin, Servant of the Servants of God, by grace Bishop of God’s holy Catholic and Apostolic Church of the Romans, together with the Synod of Bishops here canonically assembled with us for the confirmation of the true dogmas of the Catholic Church, to those who have inherited the like precious faith as we of our Lord and Saviour Jesus Christ, through the laver of regeneration, who sojourn in holiness and justice in every part of His dominion, our brethren the bishops, priests, deacons, heads of monasteries, monks, ascetics, and to the whole sacred plenitude of the Catholic Church”.