From a Catechetical instruction by Saint Cyril of Jerusalem, Bishop.
The Catholic Church is the distinctive name of this holy Church which is the mother of us all. She is the bride of our Lord Jesus Christ, the only begotten Son of God (for Scripture says: Christ loved the Church and gave himself up for her). She is the type and she bears the image of the Jerusalem above that is free and is the mother of us all, that Jerusalem which once was barren but now has many children.
The first assembly, that is, the assembly of Israel, was rejected, and now in the second, that is, in the Catholic Church, God has appointed first, apostles, second, prophets, third, teachers then workers of miracles, then healers, helpers, administrators and speakers in various kinds of tongues, as Paul says; and together with these is found every sort of virtue – wisdom and understanding, self-control and justice, mercy and kindness, and invincible patience in persecution. With the weapons of righteousness in the right hand and in the left, in glory and dishonor, this Church in earlier days, when persecution and afflictions abounded, crowned her holy martyrs with the varied and many flowered wreaths of endurance. But now when God has favoured us with times of peace, she receives her due honour from kings and men of high station, and from every condition and race of mankind. And while the rulers of the different nations have limits to their sovereignty, the holy Catholic Church alone has a power without boundaries throughout the entire world. For, as Scripture says: God has made peace her border.
Instructed in this holy Catholic Church and bearing ourselves honourably, we shall gain the kingdom of heaven and inherit eternal life. For the sake of enjoying this at the Lord’s hands, we endure all things. The goal set before us is no trifling one; we are striving for eternal life. In the Creed, therefore, after professing our faith “in the resurrection of the body,” that is, of the dead, which I have already discussed, we are taught to believe “in life everlasting,” and for this as Christians we are struggling.
Now real and true life is none other than the Father, who is the fountain of life and who pours forth his heavenly gifts on all creatures through the Son in the Holy Spirit, and the good things of eternal life are faithfully promised to us men also, because of his love for us.