How does one prove the truth?
Try it for yourself.
Excellent question!
I believe that if someone approaches the Bible with an open mind, asks questions, and listens to the arguments of informed apologists and skeptics, that they will come to the conclusion that the Bible is the Word of God.
I believe that a compelling case can be made that supports this conclusion. Obviously not everyone will reach the same conclusion as I have, but I think that everyone should endeavor to find out the answer for themselves.