The Bible must have been written by God or good men or bad men or good angels or bad angels. But bad men and bad angels would not write it because it condemns bad men and bad angels. And good men and good angels would not deceive by lying about its authority and claiming that God wrote it. And so 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.