Those called schismatics break away from the church over issues of faith and establish rival churches. We need not condemn people, only the errors and their insistence to divide and cause the schisms. Many of them are heresies and many are schisms and plain false doctrine. The church is in a mess, we are not here to put up with false doctrine and pride and hatefulness for the sake of unity, but identify and separate from the confusion so that we can go on to put the church in order and sound the alarm. It is the nature of love to warn others of a fire in our midst.
True unity begins with truth.
The second was the Reformation of the 16th century, at which time Roman Catholicism and Protestantism became divided from one another, and Protestants among themselves engaged in centuries of further proliferation. That the momentum of these centuries of divisiveness is now not only being arrested but reversed constitutes one of the central facts of the ecumenical revolution. For we know in part and we prophesy in part. But when that is perfect is come, then that which is in part shall be done away. The misunderstanding of this passage has split the church asunder, making the greater part ineffective and incomplete.