Maybe you never read about a Prophet , a man of God, that God used ? ( 1 Kings 13 ).
How God gave the message to this king and sent this man of God. God gave this prophet strict orders, and the man of God, who God chose, did as instructed, Until, an old prophet, lied to him, claiming to have a message from an angle to him, saying to stay with him, and eat.
God told the man of God, to not eat, not stop, and not turn aside.
Even though this man was even tricked, God sent a lion, and killed the man of God, because he did Not follow God's words. Yet allowed man to deceive him . God still held him accountable.
Do you think, God is not capable, of killing Paul, and preventing his writings to enter His authored written Word, if he was not obeying His words ?
Do you think God just changed His mind, and abandoned his words ?