The Gospel is the gospel of Grace i.e the underserved kindness of God demonstrated through Christ and it tells us about the peace we have with God.
If God was responsible for the believer's financial success, how come the unsaved achieve the 'financial success' many believers pray for without regard for God? Everyone will be paid for the value they take to the marketplace, the bible tells us to do something useful with our own hands... (Eph 4:28).