One True Church. That Donatists dare make the same claim is as repugnant as it is heretical. Although he has earlier insisted that no one should be coerced into professing the true faith, he later argues that civil authority has not only the right but also the obligation to force heretical sects such as the Donatists back into the church. Without such unity, both the church and civil government are vulnerable to barbarian attacks from the outside. Such reasoning is later cited in defense of the terrorist