Cyprian: Unity in the Catholic Church

I've just finished Cyprian's classic work, "Unity of the catholic Church". I think this is his main idea: Christ established His Church to be a united institution. Anyone that breaks that unity is both disobedient and outside salvation, because Christ has given His Church the promises and sacraments. Rather than simply fearing persecution, we must also be watchful for heresy and schismatics that would break this unity and lead us to hell. Here are a couple great quotes:

6. The bride of Christ cannot be made an adulteress. She is undefiled and chaste. She knows but one home, she guards with virtuous chastity the sanctity of one bed-chamber. It is she who keeps us for God and seals for the kingdom the sons she has borne. If you abandon the Church and join yourself to an adulteress, you are cut off from the promises of the Church. If you leave the Church of Christ you will not come to Christ's rewards, you will be an alien, an outcast, an enemy. You cannot have God for your father unless you have the Church for your mother. If you could escape outside Noah's ark, you could escape outside the Church...

23. ...To join those who walk wickedly, to journey with them on the roads of error and crime, straying from the true path, involves you in the same crime. There is one God and one Christ and one Church and one faith and one people, fastened together into a solid corporate unity by the glue of concord. The unity cannot be rent, nor can the one body be divided by breaking up its structure; it cannot be broken into fragments by tearing and mangling the flesh. Whatever leaves the womb cannot live and breathe apart. It loses the substance of heath.

[Cyprian, Unity of the Catholic Church in "Early Latin Theology", 1956]