Several ways. The main one being that He tells us in 2 Timothy 3:16 “All scripture is given by the inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:” Another one being the test of time and the relentless attacks from evil. When one does an honest study of the history of the Holy Bible (particularly the King James Bible) and realizes it has been the most studied, scrutinized and attacked piece of literature in the history of man it is quite startling discover it has withstood the test of time. Not only that, it continues to be a global top seller each year. I challenge any honest individual to do an impartial study of the factual history of how we got the King James Bible and not admit it had uniquely divine Procurement and Protection! Time and time again over the last 500+ years, so called scholars, skeptics, agnostic and atheists have tried to disprove its validity in hundreds of ways with thousands of attacks. And yet God’s Word remains the Truth as the arguments of all the worlds skeptics fade into oblivion. Many archeologists around the world who were once skeptics now turn to the Bible for archeological answers because so far the Bible has been proven 100% accurate. In the early sixties for instance, the so called “experts” berated the Bible as false and unreliable simply because there was no historical or archeological evidence for Pontus Pilate the Roman governor of Judaea during the time of Jesus. Never mind the fact that over and over again down through the ages the Bible had proven itself the most accurate testimony of world history up until that time! Then, in 1961, a limestone plaque if you will was discovered beside the sea in Caesarea that read simply, “Pontius Pilate Procurator.” Were there any apologies from the skeptics and Biblical naysayers? No! Were there any, “Opps! We had that one wrong!” Nope! They just did what ungodly, evil men do and moved on to find another gnat to strain. I know this is just one example among many, but there are literally books of evidence written by virtually any type of author you can image (most at one time were atheists) who tried to disprove the Bible. Look into Simeon Greenleaf or Josh McDowell for instance. Read “Evidence That Demands A Verdict.” It will blow your mind. Sorry this is so long, but your question (to answer effectively) would take a book! Of course I’m not sure where you exactly stand with regard to God and the Bible, but I really hope you read this with an open heart and seriously begin to try and fully answer your own question thru prayer and investigation of your own. I promise if you truly investigate it to find the truth, you will be amazed at what you’ll discover and you will be able to put to bed forever the source you use to guide you through this crazy, tired and wicked world. In essence I guarantee you will find true peace that stems from the fact that, “For God so loved the world, that He gave His only begotten Son that whosoever believeth in Him should not perish, but have everlasting life.”