“Now I want you to know, brothers and sisters, that the gospel I preached is not of human origin.”
What Paul preached came from God. It alone is true. Therefore, it cannot be modified in any way. Whoever changes it stands under God’s condemnation, because he gave it to save.
Is what the Bible says the only truth about God and plan of redemption? Yes! No other book, no other message, carries the divine stamp. Philosophies and theologies are useless to save.