"All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work." The Bible is inspired and inerrant, as 2 Timothy 3:16-17 says. It is composed of the very words of God that were written down by a number of people throughout the ages.
Though the unified message of love and salvation is enough to prove its divine inspiration, there is much more evidence that demonstrates the Bible's inspiration. Consider these:
Bible prophecies. There are hundreds of prophecies recorded in the Bible that have already been perfectly fulfilled. This is only possible because they were spoken by God, who is in charge of history and our timeline. Specifically, there are over 60 prophecies regarding the life and ministry of Jesus Christ
Archaeological accuracy. Skeptical scholars have tried to discredit the Bible by speculating that the Bible is not historically accurate. Major and minor archaeological finds, however, have proven its historical accuracy time and time again.
Indestructible nature. Throughout history, the Bible has been banned, burned and confiscated. In its earliest days, Roman Emperor Diocletian declared the Bible illegal and threatened death to anyone who owned a copy (300 a.d.). Since then, communist leaders, dictators and some philosophers have also tried to squelch the Bible. In every case, the Bible survived--in fact it thrived.
The Bible remains the best-selling book of all time. Why? Because it is the only book on the planet that is God-breathed. Through God's power, it will continue to survive and thrive. (The above originally appeared as an article I provided for the Essentials of the Christian Faith New Testament, published by Zondervan. Used by permission.)