Bible
In considering the source and inspiration for the Bible one must see what the Bible says of itself.  Several verses  of scripture define the source, intent, and Author.  2 Peter 1:21 says this - "No prophecy was ever made by the act of human will, but men moved by the Holy Spirit spoke from God."  Isaiah 55:11 tells us that His is a word of power - "So shall My word be that goes forth from My mouth; It shall not return to Me void, But it shall accomplish what I please, And it shall prosper in the thing for which I sent it."  Hebrews 4:12 says this - "For the word of God is alive 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."