Let's take this slowly.
25Now to him that is of power to stablish you according to my gospel,
That is about Jesus being the him who is of power to establish you according to God's gospel.
and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, 26But now is made manifest, and by the scriptures of the prophets,
That is the scriptures of the prophets in the Old Testament.
according to the commandment of the everlasting God,
God gave the commandment.
made known to all nations for the obedience of faith:
We must all have faith and obey, which is living faith not dead, as faith without obedience is.
27To God only wise, be glory through Jesus Christ for ever. Amen. {Written to the Romans from Corinthus, and sent by Phebe servant of the church at Cenchrea.