Answer:

The Bible is the Word of God. Nearly 4,000 times in the Old Testament alone, we read phrases like 'the Lord spoke', 'the Lord commanded' and 'the Lord said'. The apostle Peter says that the prophetic scriptures 'never came by the will of man, but holy men of God  spoke as they were moved by the Holy Spirit' (2 Peter 1:21).

Someone has reasoned this way. Who could have written the Bible? One or more of the angels? Impossible, for good angels don't lie, and the Bible repeatedly says, "Thus says the Lord..." Perhaps evil spirits? No, for demons and Satan do not like to be exposed for what they are and they don't command men to "Worship the Lord thy God and him ONLY shalt thou serve." Evil spirits don't want men to repent, as the Bible commands. Was it then evil men? But evil men certainly would not write such scathing denunciations of sin as we regularly find in the Scriptures, or condemn themselves to Hell. Was it then good men? No, for good men, by themselves, cannot write about such sublime things, which eye hath not seen nor ear heard. Besides, good men  don't lie; they won't write such things as this, "All scripture is  God-breathed..." if it were not the truth.

The only other alternative is that God gave the Bible as it is claimed by Bible itself.

Further evidence comes from fulfilled prophecies. In no other literature can we find scores of clear and detailed prophecies, which were later fulfilled to the letter. The odds against this happening by chance are too vast to be taken seriously.

Then there is the Bible's impact on people's lives. Millions of people over the centuries testify that the teaching of the Bible transformed their lives from darkness to light, from despair to hope, from sin to righteousness and love.

Yet many people remain skeptical. They cannot appreciate the beauty  of God's Word because they do not know God. Many heard Jesus speak and  teach but most did not recognize that His were the very words of God. Only God can open our sin-blinded eyes to see the beauty of His Word.

I recognize my Father's voice in Scripture because I am His adopted son. Jesus said: 'He who is of God hears God’s words; therefore you [who do not believe] do not hear, because you are not of God' (John  8:47).