Gregory the Great
Catena Aurea · Lukasevangelium 12
I am come to send fire on the earth; and what will I, if it be already kindled? But I have a baptism to be baptized with; and how am I straitened till it be accomplished! Suppose ye that I am come to give peace on earth? I tell you, Nay; but rather division: For from henceforth there shall be five in one house divided, three against two, and two against three. The father shall be divided against the son, and the son against the father; the mother against the daughter, and the daughter against the mother; the mother in law against her daughter in law, and the daughter in law against her mother in law.
(in Ezech. lib. i. Hom. 2.) Or else, fire is sent upon the earth, when by the fiery breath of the Holy Spirit, the earthly mind has all its carnal desires burnt up, but inflamed with spiritual love, bewails the evil it has done; and so the earth is burnt, when the conscience accusing itself, the heart of the sinner is consumed in the sorrow of repentance.