In him we were also chosen, having been predestined according to the plan of him who works out everything in conformity with the purpose of his will. (Ephesians 1:11 NIV)
God owns us because He created us. He has the power and authority to do anything He wants. But look at the kindness of God. He appointed us, even before He created us, to accomplish His will. He has planned beforehand that we will do things for His glory – to demonstrate and make known His love, wisdom, and saving power even to the angels. We cannot do otherwise because we are designed to do so. We are made perfectly to do His will according to His plan. We should now devote ourselves to perfectly do His will, proclaim His glory, and save a soul.