In short, an astonishingly broad spectrum of theologies of justification existed in the later medieval period, encompassing practically every option that had not been specifically condemned as heretical by the Council of Carthage. In the absence of any definitive magisterial pronouncement concerning which of these options {or even what range of options} could be considered authentically catholic, it was left to each theologian to reach his own decision in this matter. A self-perpetuating doctrinal pluralism was thus an inevitability.
( Alister E. McGrath )
[ The Intellectual Origins of ]
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