St. Jerome was famously grumpy.
He wanted the Catholic Church to adopt the masoretic text for the canon of the old testament
The other Church Father's shot him down and argued that the Septuagint more closely reflected the Scriptures Jesus used
St. Jerome obeyed but he didn't like it, so he labelled the extra books "deuterocanonical"
There were lots of apocalyptic texts telling of death and destruction in the early Church
No secret since many were tortured and killed for their faith
However, most texts were not taken seriously but two texts struck a deep nerve - the apocalypse of Peter and the apocalypse of John
The apocalypsee of Peter was the first draft of Dante's inferno - describing tortures for bad people in hell.
The apocalypse of John revealed how the liturgy on earth was connected to the liturgy in heaven. It was meant as a consolation for those persecuted.