If thou hadst known,— O that thou hadst known! It is certain, as we have before observed, that the particle ει is sometimes used to express an ardent wish; and the connection here will very well bear it. But if our translation be retained, it must be acknowledged that the broken manner of speaking is very emphatical: our Lord will then seem to pause, in a silent reflection on the happy consequences which would have attended their obedient regard to his invitations and addresses. See on Luke 19:44.
Related Commentaries of Luke 19:42
Luke 19:42
42 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.