Half of the readers of this just ask “what?” and the rest smugly commented, “we don’t have the original autographs.”
Plenary is just a big fancy theological word for; complete, total, unconditional, absolutely everything under consideration. The Original Autographs are the books of the Bible as they were written by their respective authors at the time they were written.
This is important because there is a whole school of theology (Neo-Orthodoxy) that teaches that the books of the Bible were not written by the authors ascribed to them and the time they are traditionally believed to have been written.
Most of their theories have been totally shown to be unfound by later scholars. The most useful of these is The Old Testament it claims and Its Critics by O.T. Allis, where many of their attacks are explained away.
One of the last hold out was their theory of late dating the book of Daniel. In the book of Daniel there are long prophecies about the kings of Persia, Assyria, and Egypt. This prophecy is so accurate about these kings that the Neo-Orthodox who never believe any of the miracles of the Bible are real events, claim that Daniel must have been written after the facts. The last king mentioned is Julius Caesar pitching his tent between the Mediterranean Sea and Jerusalem.
And he shall pitch his palatial tents between the sea and the glorious holy mountain; yet he shall come to his end, with none to help him. Dan. 11:45
One of the most obvious problems with this liberal scholarship is presented by the Septuagint, i.e. LXX, as it was the first translation of the Hebrew Bible into another language (Greek). Tradition holds that seventy men from the twelve tribes of Israel met in Alexandria, Egypt to translate the Bible at the behest of Ptolemy II 283BC-246BC. The Septuagint contains the Book of Daniel 150 years before the Maccabean revolt. However most damning of their late dating of Daniel is that recently, a fragment of Daniel has been found in the cache of the Dead Sea Scrolls that dates roughly to within 50 years of Daniel’s internal date. See: New Light on the Book of Daniel from the Dead Sea Scrolls.
If one does not believe that the writers of the Scripture was inspired by God, what are we doing?
All scripture is inspired by God and profitable for teaching, for reproof, for correction, and for training in righteousness, 2Tim. 3:16