For my part, I am going to boast about nothing but the Cross of our Master, Jesus Christ. Because of that Cross, I have been crucified in relation to the world, set free from the stifling atmosphere of pleasing others and fitting into the little patterns that they dictate. Can't you see the central issue in all this? It is not what you and I do - submit to circumcision, reject circumcision. It is what God is doing, and he is creating something totally new, a free life! All who walk by this standard are the true Israel of God- his chosen people. Peace and mercy on them! (Galatians 6, 14-16 The Message bible).
We are exhorted to boast of His finished work on the cross and what He has done for us, not boasting of what we can do or what good works we have done. Let us boast of this totally new, free life He has given us.