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there is a possibility that the epistle of barnabas was written by the biblical barnabas...the consensus in the ancient christian church is that he was the author...in spite of that fact most ancient christians never recognized it as inspired scripture...
however nowdays most scholars including conservative christian scholars are convinced that it was not written by the biblical barnabas...the modern consensus is that it was either written 'in his name' by an admirer...in which case the theology of the epistle may actually closely resemble the teaching of the biblical barnabas...or else that it was written by another early christian named barnabas who is not mentioned in scripture...
the 'gospel of barnabas' on the other hand is unanimously regarded as a fraud by both christian and secular scholars...really only certain muslim apologists regard the book as anything even remotely resembling an accurate account of the life of jesus...
however nowdays most scholars including conservative christian scholars are convinced that it was not written by the biblical barnabas...the modern consensus is that it was either written 'in his name' by an admirer...in which case the theology of the epistle may actually closely resemble the teaching of the biblical barnabas...or else that it was written by another early christian named barnabas who is not mentioned in scripture...
the 'gospel of barnabas' on the other hand is unanimously regarded as a fraud by both christian and secular scholars...really only certain muslim apologists regard the book as anything even remotely resembling an accurate account of the life of jesus...
The wisdom given to our beloved Barnabas is spiritual.
There are many beautiful gems contained in his epistle for those who have learned to compare spiritual with spiritual.