Gregory the Great
Catena Aurea · Lukasevangelium 19
And when he was come near, he beheld the city, and wept over it, Saying, If thou hadst known, even thou, at least in this thy day, the things which belong unto thy peace! but now they are hid from thine eyes. For the days shall come upon thee, that thine enemies shall cast a trench about thee, and compass thee round, and keep thee in on every side, And shall lay thee even with the ground, and thy children within thee; and they shall not leave in thee one stone upon another; because thou knewest not the time of thy visitation.
(ut sup.) For our Redeemer does not cease to weep through His elect whenever he perceives any to have departed from a good life to follow evil ways. Who if they had known their own damnation, hanging over them, would together with the elect shed tears over themselves. But the corrupt soul here has its day, rejoicing in the passing time; to whom things present are its peace, seeing that it takes delight in that which is temporal. It shuns the foresight of the future which may disturb its present mirth; and hence it follows, But now are they hid from thine eyes.