When Paul in his writings spoke of promises he did not speak of the words that he was writings as promises. Paul did not equate his writings as the scriptures. Over and over he said “it is written”. The promises Paul spoke about in his writings were the innumerable and uncountable prophecies of the Old Testament. The prophecies are God’s promises about the Christ, who is Yeshua of Nazareth.
Again Paul does not equate his words with the scriptures, as do not any of the other apostolos. Now words of understanding come forth from “accepting by grace the fulfilled the innumerable and uncountable promises of the scriptures concerning Christ”. No matter how wonderful the words of understanding are, they replace not the promises. Or in other words, declaration of doctrine does not replace the preaching of the one true gospel. Out of the preaching of the one true gospel comes forth doctrine, which is understanding. The one true gospel does not come forth from doctrine. The one true gospel comes forth from grace given to man by the will of God. Grace given to man to accept the gospel message: the Christ died for our sins according to the scriptures, He was buried and He rose again the third day according to the scriptures: Yeshua of Nazareth is the Christ.