Jesus' ascent to Jerusalem
Jesus recalls the martyrdom of the prophets who had been put to death in Jerusalem. Nevertheless he persists in calling Jerusalem to gather around him: "How often would I have gathered your children together as a hen gathers her brood under her wings, and you would not!" When Jerusalem comes into view he weeps over her and expresses once again his heart's desire: "Would that even today you knew the things that make for peace! But now they are hid from your eyes."
Source: Catechism of the Catholic Church (Vatican.va)