He is the one who enables us (exc) to be his messengers. He has enabled us to tell people the message about the new agreement that he is making with them. This is not a message about obeying all the written laws of his old agreement that he made with the Jewish people. Instead, it is a message about God giving us his Spirit. Previously, God condemned people to be separated from him forever if they did not obey his laws. But by God’s new agreement his Spirit enables people to live eternally.