Lk 19:41 As he approached Jerusalem and saw the city, he wept over it
Lk 19:42 and said, “If you... had only known on this day what would bring you peace—but now it is hidden from your eyes.
Lk 19:43 The days will come upon you when your enemies will build an embankment against you and encircle you and hem you in on every side.
Calamity and destruction will descend on Jerusalem because they had rejected their Messiah. 70 AD came, and Jerusalem, particularly its temple, was leveled to the ground. More or less 1 million Jews were killed when the Romans came and sacked Jerusalem. IF ONLY THEY HAD KNOWN WHAT WOULD HAVE BROUGHT THEM PEACE it would have been different. The Prince of Peace, the Lord Jesus, was right there, offering Himself to them, but they rejected Him.
My friend, you don't have to be like the Jews. My friend, like everybody else in the world, you are a sinner, a spiritual criminal in the eyes of God, at enmity with Him, subject to His just judgment that will be executed upon you when the time comes.
But here's what will bring you peace with God: Jesus Christ, the Savior. He died for your sins and rose again from the dead. Through Him you can be reconciled to God. Now that you have known the way of peace with God, come to Christ in repentance and faith, trusting in what He did for you at the cross. Come and be at peace with God.
