Proclaiming the gospel to a lost world cannot be just another activity to add to the church's crowded agenda. It must be central to who we are. It forms our identity.
God has not had an identity crisis. He knows that he is Great and deserves to be the center of our lives.
Because I want to get a lot done, I can sometimes do that in the flesh. If I don't rest in the Lord, and enjoy him as I should, my action doesn't spring from my identity and enjoyment of Christ. When that happens, I end up getting the glory rather than Jesus.