When you call something "THE".... then that negates the possibility that there are any others. You are in effect saying that it is THE only one. When you attach "THE" to an object, then you are, by implication, saying that there is only one. There is no other, and there is no other way. Conversely, if you call something "A" Something, then you, by implication, indicate that it could be only one of many.
Now let us attach "THE" to an object, more specifically a book that many call "THE" Word of God.
I have a question. Has God ever spoken outside of the Bible? Did God ever speak before the Bible was put together?