Because the creature itself also - “even the creation itself.”
shall be delivered from the bondage of corruption - its bondage to the principle of decay.
into the glorious liberty - rather, “the liberty of the glory.”
of the children of God - that is, the creation itself shall, in a glorious sense, be delivered into that freedom from debility and decay in which the children of God, when raised up in glory, shall expatiate: into this freedom from corruptibility the creation itself shall, in a glorious sense, be delivered (So Calvin, Beza, Bengel, Tholuck, Olshausen, De Wette, Meyer, Philippi, Hodge, Alford, etc.).