It is not a new law or command. It rather is an appeal to live up to what God has already done for you. Paul's plea is to live a life worthy of our calling. That puts our Christian character on a lofty plane. The sequence is significant.
Ethics follows faith.
The gospel is the healthy message that our goodness comes out of our desire to be worthy of the love of God that we have already come to know in Jesus Christ. These are the five smooth stones of Christian character and Christian charity. They are the gentle virtues, which make a little noise. These are the virtues that maintain unity in the church. This quality was much despised in the ancient secular world.