What does it mean that the gospel is 'God's gospel'?

'God's gospel' indicates that the message of salvation is initiated by God, illustrating His sovereignty throughout history. Paul points out that it is not a human invention but a divine revelation of God’s mercy and grace towards sinners. This perspective emphasizes that salvation is secured by God's actions—purposed by God the Father, accomplished by God the Son, and applied by God the Holy Spirit. Understanding the divine authorship of the gospel allows believers to trust completely in God's initiative for salvation.