mark a:
By whom and when was the order of the books of the bible decided? Is the order simply chronological?
About that second question - simple answer, “No”.
More complex answer: the 14 letters attributed to St.Paul are arranged by the number of lines they came to, and are broken down into three sub-groups: 10 which were regarded as his from very early on, three (1 Tim, 2 Tim, Titus) which were more questionable, and one (Hebrews) which was earlier to gain recognition in the East as Pauline than in the West.
They are not in order of date - if they were, 1 Thessalonians would be first in order. Some are to the same recipients, others are alike in contents. These days, between 7 & 10 are generally recognised as his: Ephesians is often regarded as not his.
Acts is part of a two-book work, Luke being the earlier book. The reason they are separated, is that Luke’s character as a gospel trumped its position as a work of Luke, so the more important books, the gospels, go together, and the Acts has to get by without directly following the book to which it is a sequel. So it gets as close to its gospel as it can, and directly follows John’s Gospel.
IIRC the gospels are in their order because:
Matthew is an Apostle - so comes first
Mark is an associate of an Apostle - so he comes second
Luke was an associate of Paul who, though an Apostle, was not one of the original Twelve who knew Jesus face to face on earth - so he is next
John’s gospel was not received as canonical without some controversy - which may be why his is last.
Acts has been mentioned; “the Apostle” - the letters of Paul - follow the Gospel in importance, so they come next, by length. The undisputed “Catholic” or “Universal” letters come next: the ones that are not written to a named recipient. Some Catholic letters took a time to be recognised, for a variety of reasons, so they come next - 2 Peter was one of them. In addition, they are much shorter than the other NT books. Doubts about Revelation are probably the reason it is last - to this day, there is at least one ancient Church which does not recognise it as canonical.
So there was a number of considerations at work in influencing the order of the NT books.
The OT is just as complicated
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