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. – 2 Timothy 3:16-17
Of the authorship of the Bible, John Wesley said, “The Bible must have been written by God or good men or bad men or good angels or bad angels.” And then he said, “But bad men and bad angels wouldn’t write it because it condemns bad men and bad angels. And good men and good angels wouldn’t deceive by lying to its authority and claiming that God wrote it.” “And so”, said Wesley, “the Bible must have been written as it claims to have been written by God who by His Holy Spirit inspired men to record His words using the human instrument to communicate His truth.”
The Bible claims for itself that it is:
Infallible – without error in total – Psalm 19:7 The law of the LORD is perfect, reviving the soul. The statutes of the LORD are trustworthy, making wise the simple.
Inerrant in all it’s parts – Pr 30: 5-6 Every word of God is flawless; he is a shield to those who take refuge in him. Do not add to his words, or he will rebuke you and prove you a liar.
Complete – Deut 4:2 You shall not add to the Word which I am commanding you, nor take away from it. Rev 22:18-19 – I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book.
Authoritative – Isaiah 1:2 Hear, O heavens, and give ear, O earth: for the LORD hath spoken. Psalm 119:89, Forever, O Lord, Thy Word is settled in heaven.
Sufficient – 2 Tim 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17That the man of God may be perfect, thoroughly furnished unto all good works.
Effective – Isaiah 55:11 So is my word that goes out from my mouth: It will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it.
Divine – 2 Pet 1:21 21For prophecy never had its origin in the will of man, but men spoke from God as they were carried along by the Holy Spirit.
NOTE: The above was gleaned from The Character of the Word by John MacArthur