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The writings of St. Augustine are not authoritative in every detail. I have read that his early works and his later works do not agree on this. What made him change? Maybe he saw the confusion and bad fruit of BoD and recognized the problem that it is.
The Good Thief has nothing to do with Baptism because he died before Holy Baptism was instituted, therefore he was in the Old Dispensation, before the Church was born (on Pentecost Sunday). There was no baptism as a Sacrament at that time. Nobody had been baptized before Christ instituted the Sacrament, and the first mention of the institution in Scripture is at Our Lord's Ascension into heaven, 40 days after Pentecost. The baptism of John (the Baptist) was not a sacrament. It was the precursor to Holy Baptism.
If Fr. Cardozo was using the Traditional Form of Baptism there would be no mention of any BoD, so he must have been using some newfangled corruption of the Sacramental form, which could have invalidated his baptism anyway. Baptisms have been validly administered for 2 thousand years without any questioning about the theological speculation of whether a mere desire for it suffices without water.
I used to be an advocate of Fr. Cardozo but now I'm not so sure any more. How sad.
These are crazy days.
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