"Jesus is Lord!" That doesn't just mean that we have yielded our lives to his will and trusted in his grace. "Jesus is Lord!" This means that everything that is created is his. All angels, demons, and spirits are below him and their purpose is to honor and serve him. Even though demons have chosen not to honor and serve him, that decision does not change what their purpose should be nor the fact that Jesus showed his superiority over them in his crucifixion and resurrection.  It means the universe, with its vast expanse and glory, was made by him and made to declare his glory. As God's image to us, God's presence for us to know and see, he is our King, Lord, and Savior. If our life is in his hands and our hearts are yielded to his will, then no one and nothing can prevent his ultimate victory for us and in us.