The authority and inspiration of the Bible.
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The Bible was produced as a result of the direct inspiration of God by means of His Holy Spirit. That is the fundamental basis for belief.
2 Timothy 3:16, 17 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work.
2 Peter 1:19-21 And so we have the prophetic word confirmed, which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your hearts; knowing this first, that no prophecy of Scripture is of any private interpretation, for prophecy never came by the will of man, but holy men of God spoke as they were moved by the Holy Spirit.
That is a very small sample of what the Bible says about itself. However, what external evidence is there? There is the stunning evidence of Bible Prophecy, the witness of history and archaeology, the amazing witness of the nation of Israel which brings Bible prophecy to our headlines on a daily basis and, most importantly, the witness of the resurrection of the lord Jesus Christ.
Here are links to information on the website which you will find helpful:
The Divine Origin of the Bible: www.thisisyourbible.com/library/show/160
The Miracle of the Bible: www.thisisyourbible.com/library/show/149
Bible Prophecy: www.thisisyourbible.com/library/show/154
Evidence for Design: www.thisisyourbible.com/library/show/327
The Evidence of Bible Prophecy: www.thisisyourbible.com/library/show/1032
Israel, God's People... www.thisisyourbible.com/library/show/168
Why I believe the Bible: www.thisisyourbible.com/library/show/611
If you want to come to grips with what the Bible really teaches, why not take the free Bible study course on www.thisisyourbible.com? You may take this course either online or by regular mail.
This course will give you a background in the major themes of the Bible from Genesis to Revelation. As with everything we offer, there is no cost to you other than your time and effort. You will also have a personal tutor to whom you may pose questions either from the course itself or those questions which come to you as you read the Bible.
I hope you have found this helpful.