An Epistle of Dionysius to Novatus
1 But let us see how the same man addressed Novatus when he was disturbing the Roman brotherhood. As he pretended that some of the brethren were the occasion of his apostasy and schism, as if he had been forced by them to proceed as he had, observe the manner in which he writes to him:
2. “Dionysius to his brother Novatus, greeting. If, as you say, you have been led on unwillingly, you will prove this if you retire willingly. For it were better to suffer everything, rather than divide the Church of God. Even martyrdom for the sake of preventing division would not be less glorious than for refusing to worship idols. Nay, to me it seems greater. For in the one case a man suffers martyrdom for the sake of his own soul; in the other case in behalf of the entire Church. And now if you can persuade or induce the brethren to come to unanimity, your righteousness will be greater than your error, and this will not be counted, but that will be praised. But if you can not prevail with the disobedient, at least save your own soul. I pray that you may fare well, maintaining peace in the Lord.” This he wrote to Novatus.
Source: Church History (New Advent)