The Bible was not written by man alone.

All of the people who wrote the Bible were under divine inspiration of the Holy Ghost. They did not write it on their own by themselves. All textbooks and books other than the Bible are written by man. But not the Bible. Only the Bible is under supernatural influence by the power of God the Holy Ghost. Amen.

"Knowing this first, that no prophecy of the scripture is of any private interpretation.

For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost." 2 Peter 1:20-21 (KJV)

"All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:" 2 Timothy 3:16 (KJV)