In Romans 9:15, we read a quotation from Exodus 33:19. “I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.” In other words, each of us whom God's grace has saved has received a calling to do the work of God. Gifts have been given to us to fulfill the work God gave us. Paul was gifted as an apostle. That particular gift was foundational and is no longer one of the gifts to be used today.
We need to be exercised before the Lord to be committed to the work to which we have been commissioned. He enables us to do what He expects by giving us the ability to accomplish that work. The furtherance of the Gospel of God is a work to which all Christians need to give their labor. Paul was involved at the beginning of this great work. We are to be involved in our day near the end of this age of the Gospel of the grace of God.
On the Gospel of God: Good News (Gospel) comes from the Old English word (godspel). God has provided salvation from sin through the death, burial, and resurrection of our Lord Jesus Christ. God is the Originator of the Gospel. He is the Source who has sent separated servants into the world to proclaim the Gospel. There is power in the Gospel we preach, but we need the power of God to preach it. Looking back, the “Gospel of the grace of God [Acts 20:24] tells of His undeserved favor to sinners. Looking around, the Gospel can change lives and destinies [Rom.1:16]. Looking ahead, the Gospel of Glory clearly states a far better future [2 Cor.4:4].
The Gospel is divine in its source [Rom.1:1], personal in its message [Mk.1:1]; life-giving to those who receive it [1Cor.4:15], saving eternally in its work [Eph.1:13]; full in its blessing [Rom.15:29]; powerful in changing those who believe it [Rom.1:16]; practical when it is lived out [Phil.1:27]; glorious in its impact [2Cor.4:4].