The Scripture is replete with support for the doctrine of Conditional Immortality/Annihilation.
Perhaps it is not 100% without any doubt whatsoever: But a Biblical case can easily be made for it.
There is early church support for Universalism, Annihilation and Eternal Conscious Torment.
The problem with reading the Early Church Fathers is that we tend to read into what they say our assumptions about what they mean. They don't use the Theological buzz-words we use because they didn't exist. They simply used Biblical terminology. We often make assumptions about what the ECF's meant because they are simply quoting the same passages we quote when we assert our viewpoints. We see them quote the same verse we quote and assume they mean the same thing we mean.
It is a near certainty that annihilationism was asserted in the ECF's........... (long before Arnobius of Sicca.)
Many people incorrectly believe that, save for a few nut jobs, cults, and liberals who don't care about the Bible, Christians of all stripes have always
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