Gregory the Great, on Isa 31:9

“And his strength shall pass away with dread, and his princes fleeing shall be afraid: the Lord hath said it, whose die is in Sion, and his furnace in Jerusalem.”

“Of this love that is begun here to be perfected from the sight of the Lord in the eternal kingdom Isaiah rightly speaks, saying, "The Lord lives, whose fire is in Zion, and his furnace in Jerusalem." It is, however, greater to be a furnace than a fire because a fire can also be small, but a larger flame is kindled in a furnace. Zion truly is said to be speculation but Jerusalem the vision of peace. Truly we sometimes catch a glimpse of our peace here in order there later to see it fully. Therefore through the Lord's love the fire is in Zion and his furnace in Jerusalem because here we burn in some measure with the flames of his love when we glimpse him, but there we shall burn totally when we shall fully see him whom we love.”

Imported from an open dataset — not yet checked against the printed edition.