Established. Romans 16:25-27 God was in the past, and still is today able to establish His people through the preaching of the Gospel and the preaching of Jesus Christ to the nations. A settled condition of a person in regards to the teachings of the commandment of the eternal God, stabilizes that person so they are not moved about or manipulated by anyone who might come against him.
This epistle begins with showing the awfulness of man's sin and the condemnation it brings on all of us. It goes on to explain the truth of salvation by grace alone apart from works. Then points out that by the most available means to every person, that is by faith; they can come into the good of that salvation now. The law and its purpose are clarified. The blessings that have come through Christ are clearly defined so we can know all who believe on the Lord Jesus Christ have been made partakers of God's great salvation, whether they are Jews or Gentiles. The indwelling Holy Spirit is able to reveal the scriptures to us, so that God's purposes for us are made clear. The "only wise God" is certainly glorified in and through our Lord Jesus Christ.
Paul's Gospel has clarified God's purposes and all nations of the earth have been shown the way faith works and what pleases God. "Without faith it is impossible to please Him." Paul knew much more was going to be passed on to the saints of God by subsequent epistles. This letter makes clear the basis of God's salvation and opens the door to further truths that have been laid out and unfolded through the order we find the books in the New Testament. God's wisdom and ways are surely past finding out, but when He reveals Himself and His will to us through the scriptures, we can only bow in humility and awe at the amazing grace of our God to us!