Hebrews 4:12
For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.

 

NIV

 

The Bible is not just one man's opinion.  It was written by over 40 authors (approximately 31 Old Testament and 11 New Testament writers - the greater majority of them being eyewitnesses) over a period of at least 1500 + years (from @ 1445 BC to 90 AD). 

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Yet, throughout all its writers and time passing there is one consistent message which winds its way through the Bible and that is:  What God has done for us to bring us back to Himself.