"Now to him who is able to strengthen you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery that was kept secret for long ages but has now been disclosed and through the prophetic writings has been made known to all nations, according to the command of the eternal God, to bring about the obedience of faith— to the only wise God be glory forevermore through Jesus Christ! Amen."
Jesus came into the world to bring about the obedience of faith. It is through this obedience of faith that the only wise God is glorified forevermore through Jesus Christ. God is no longer a secret, but plainly seen and beheld by all in the person of Jesus Christ through the obedience of faith, that is, the obedience that is faith.
To believe in the One God has sent is a work (John 6:29) of obedience. We are called to believe the gospel of Jesus Christ (that is the gospel which is Jesus Christ which he also proclaims) (Mark 1:15) and to trust the Lord God. Those who love the Lord then you trust him as well. If you trust God has your best interests in mind, why wouldn't you obey him?
And God has proven himself through Christ to be just and good for while we were still sinners Christ died for us (Romans 5:8). He saw us kicking about in our blood and said to us "Live!" (Ezekiel 16:6) So to him who is able to strengthen us through the gospel be the glory forever and ever!