Luke 19:41-44

He beheld the city, and wept over it. This lament over the wicked city is given only by Luke (Lu 19:41-44). In that moment when the multitude is shouting his praises, his heart is breaking over the woes of the city that he knew would slay him. Only in one other place are we told that Jesus wept (Joh 11:35), each time over human sorrow. If thou hadst known . . . in this thy day. The day of opportunity and mercy. But their eyes were blinded by unbelief.

The things [which belong] unto thy peace. The acceptance of Christ would have prevented the rebellion against Rome, the destruction of the city, and would have secured heavenly as well as earthly peace.
Thine enemies shall cast a trench about thee. The Romans threw a wall around the city outside of the walls of defense in order to hem in all the population and to starve them out. Shall not leave in thee one stone upon another. The city was utterly destroyed. See notes on Mt 24:2,6,21,34.

Because thou knewest not the time of thy visitation. When Christ came to save them from their awful fate.
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