By unity is meant that the members of the true Church must be united in the belief of the same doctrines of revelation, and in the acknowledgment of the authority of the same pastors. Heresy and schism are opposed to Christian unity. By heresy, a man rejects one or more articles of the Christian faith. By schism, he spurns the authority of his spiritual superiors. That our Savior requires this unity of faith and government in His members is evident from various passages of Holy Writ. In His admirable prayer immediately before His passion He says: “I pray for them also who through their word shall believe in Me; that they all may be one, as Thou, Father, in Me and I in Thee, that they also may be one in Us; that the world may believe that Thou hast sent Me,”(16) because the unity of the Church is the most luminous evidence of the Divine mission of Christ. Jesus prayed that His followers may be united in the bond of a common faith, as He and His Father are united in essence, and certainly the prayer of Jesus is always heard. St. Paul ranks schism and heresy with the crimes of murder and idolatry, and he declares that the authors of sects shall not possess the Kingdom of God.(17) He also addresses a letter to the Ephesians from his prison in Rome, and if the words of the Apostle should always command our homage, with how much reverence are they to be received when he writes in chains from the Imperial City! In this Epistle he insists upon unity of faith in the following emphatic language: “Be careful to keep the unity of the Spirit in the bond of peace; one body and one Spirit, as you are called in one hope of your calling; one Lord, one faith, one baptism, one God and Father of all, who is above all, and through all, and in us all.”(18) As you all, he says, worship one God, and not many gods; as you acknowledge the same Divine Mediator of redemption, and not many mediators; as you are sanctified by the same Divine Spirit, and not by many spirits; as you all hope for the same heaven, and not different heavens, so must you all profess the same faith. Unity of government is not less essential to the Church of Christ than unity of doctrine. Our Divine Saviour never speaks of His Churches, but of His _Church_. He does not say: “Upon this rock I will build my Churches,” but “upon this rock I will build My Church,”(19) from which words we must conclude that it never was His intention to establish or to sanction various conflicting denominations, but one corporate body, with all the members united under one visible Head; for as the Church is a visible body, it must have a visible head.