The Apostle Paul closes his Roman epistle with these words, Now, to him that is of power to stablish you...to God only wise, be glory through Jesus Christ for ever.  Amen (Romans 16:25-27).  God has the power to establish us, that is, to put us in a position that will last for ever.  In these verses, the Lord reveals the four means by which God establishes us in Christ.  Each is identified by the words according to.  Each is in agreement with the others.  They are as follows: according to (#1.) my gospel and (#2.) the preaching of Jesus Christ; according to (#3.) the revelation of the mystery and according to (#4.) the commandment of the everlasting God, made known to all nations for the obedience of faith by the scriptures of the prophets.  The scriptures of the prophets refers to the Old Testament; the revelation of the mystery kept secret since the world began refers to the New Testament.  Paul's preaching of the gospel of Jesus Christ fills the period prior to the New Testament's completion, as does our Lord's preaching and teaching.  Jesus declared to those who sought to kill him, If ye believe not his writings [the writings of Moses], how shall ye believe my words (John 5:47)?  Of the saints during Christ's public ministr, the Lord testifies, I have given unto them the words which thou gavest me; they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me (John 17:8).   God's great salvation has not changed: it has always been through faith in the Lord Jesus Christ, God's gift of grace to sinful man.