Gregory the Great
His heart is as hard as stone, as noted in Job 41:16. The spirit of the ancient adversary is unwavering, for it will never soften through repentance. His eternal inheritance will be solely punishment, hence it is fittingly stated that he will be bound like an anvil. The term "anvil" refers to one that endures relentless strikes. An anvil is designed specifically to withstand constant blows. Consequently, Leviathan will be fastened as an anvil, bound by the chains of hell to bear the perpetual punishment of condemnation. Even now, he serves as an anvil, lying in wait as any of the chosen ones are delivered, while he himself suffers from the agony of loss.
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Just as various tools are shaped upon the anvil, yet the anvil itself remains unchanged despite the numerous strikes, so it is with Leviathan. We are shaped through the trials he inflicts, but he remains constant and will never transform into a vessel of usefulness. We are placed against his blows and, having endured his temptations via the hand of the heavenly craftsman, we emerge from his anvil refined and purposeful. He is bound; although he currently roams the earth with his temptations, when cast into the abyss and faced with divine judgment, he will cease to walk. From this, we conclude: