The Fall of Jerusalem Predicted (Lk. only). Cf. the words of Jesus to the daughters of Jerusalem, Luke 23:28-31. The passage takes the place of the withering of the fig-tree narrated by Mk. and Mt., which Lk. has already dealt with in different fashion, Luke 13:6-9. The use of the word bank (Luke 19:43), i.e. rampart, has been held to show that the prediction, if not composed, was at least revised, after the Fall of Jerusalem.
Luke 19:44. You would not understand when God was visiting you (Moffatt); visitation is a neutral term, here denoting the day of opportunity and testing.