"Now to him that is of power to establish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, but now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:" (Rom 16:25, 26).
In this verse, the importance of obedience of faith is seen as the "the mystery, which was kept secret since the world began, but now is made manifest, and by the Scriptures..." The obedience of faith springs from love of God Father, God Son, and God Holy Spirit. Without that love there can be no obedience, no true discipleship.
Grace (pistews) is a gift that cannot be earned. Apostleship is the God-given authority to convey the revelation of God’s salvation, to share the Gospel of saving grace. From the beginning, the Holy Trinity has been working out the salvation of all who turn to the Holy One.