Cyprian

But that the Church is one, the Holy Spirit declares in the Song of Songs, saying, in the person of Christ, "My dove, my undefiled, is one; she is the only one of her mother, she is the choice one of her that bare her." Concerning which also He says again, "A garden enclosed is my sister, my spouse; a spring sealed up, a well of living water." But if the spouse of Christ, which is the Church, is a garden enclosed; a thing that is closed up cannot lie open to strangers and profane persons. And if it is a fountain sealed, he who, being placed without has no access to the spring, can neither drink thence nor be sealed. And the well also of living water, if it is one and the same within, he who is placed without cannot be quickened and sanctified from that water of which it is only granted to those who are within to make any use, or to drink.

But that the Church is one, the Holy Spirit declares in the Song of Songs, saying, in the person of Christ, "My dove, my undefiled, is one; she is the only one of her mother, she is the choice one of her that bare her." Concerning which also He says again, "A garden enclosed is my sister, my spouse; a spring sealed up, a well of living water." But if the spouse of Christ, which is the Church, is a garden enclosed; a thing that is closed up cannot lie open to strangers and profane persons. And if it is a fountain sealed, he who, being placed without has no access to the spring, can neither drink thence nor be sealed. And the well also of living water, if it is one and the same within, he who is placed without cannot be quickened and sanctified from that water of which it is only granted to those who are within to make any use, or to drink.

This one church is also intended in the Song of Songs, when the Holy Spirit says, in the person of the Lord: “My dove, my perfect one, is but one; she is the only one of her mother, the choice one of her that bare her.” Can one who does not keep this unity of the church believe that he keeps the faith? Can one who resists and struggles against the church be sure that he is in the church? For the blessed apostle Paul gives the same teaching and declares the same mystery of unity when he says, “There is one body and one Spirit, one hope of your calling, one Lord, one faith, one baptism, one God.”