“…that has come to you. All over the world this gospel is bearing fruit and growing, just as it has been doing among you since the day you heard it and understood God’s grace in all its truth.” Colossians 1:6
The Gospel will always bear fruit and grow! The growth is both reproductive (“bearing fruit”) and maturing (“increasing”); together the gospel accomplishes the work God intends. Paul uses the same term in verse 10 in his prayer for the Colossian Christians for their growth in the knowledge of God’s will; that they would please God by, “bearing fruit in every good work, growing in the knowledge of God.”
The Gospel must be solely focused on the person and work of Christ; there must be no other message preached. The advance of the gospel is the advance of the work of God in changing the lives of those who hear and believe the message.