Gregory the Dialogist

Have the gates of death been opened unto thee, and hast thou seen the gloomy doors? For the 'gates of death' are the adverse powers. Which the Lord descended and opened, because by dying He overcame their strength. Which are by another appellation called the 'gloomy doors,' because while they are not seen, by reason of their crafty concealment, they open to deceived minds the way of death. Which gloomy doors the Lord beholds; because He both observes and represses the crafty malice of unclean spirits. …

Morals on the Book of Job, Book XXIX ↗

Thomas Aquinas

After the disposition of the land and the sea he proceeds to the disposition of heaven under which air is contained. He lingers a little longer on this because of the many marvelous things which appear there. First, he considers the disposition of the light and the darkness which embraces the whole of the higher body in common. Consider that the heavenly bodies act through their own light on lower bodies. This is so because light is like the active quality of the heavenly bodies, like cold and heat of the elements. …

Commentary on Job ↗