Augustine of Hippo
They have tarnished His covenant. Consider the covenant they have desecrated: In your Seed shall all nations be blessed. What can you say in response to these words of the Covenant Maker? Only the Africa of St. Donatus has earned this grace, for the Church of Christ was preserved within him. We might refer to it as the Church of Donatus. Why do you insist on adding Christ? It is written, ‘In thy Seed shall all nations be blessed.’ Will you abandon Christ after Donatus? Dispense with Christ, and then you may fracture unity. Now observe the consequence: they have tarnished His covenant. What covenant? The promises were made to Abraham and to his Seed.
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The Apostle declares, ‘But the testament of man, once ratified, no one nullifies or adds to it: The promises were made to Abraham and to his Seed. It does not say, And to the seeds, as if referring to many; rather, And to your Seed, which is Christ' (Galatians 3:15-16). So what is the covenant promised in this Christ? In your Seed shall all nations be blessed. You, who have rejected the unity of all nations and have chosen to be a faction, have desecrated His covenant.