For instance, in the punishment of heresy. The ante-Nicene church was purely ecclesiastical, and consisted in reproof, deposition, and excommunication. It had no effect on the civil status.
But as soon as church and state began to be united, temporal punishments, such as confiscation of property, exile, and death, were added by the civil magistrate with the approval of the church, in imitation of the Mosaic code, but in violation of the spirit and example of Christ and the apostles.
Rome should have seen greater disaffection from the other churches for this, but instead, was allowed to increase in her influence over Christendom.