John Trapp on Luke 19:42

Verse 42. Oh, if thou hadst known] They had cognitionem historicam non mysticam, speculativam non affectivam, apprehensionis, non approbationis, discursivam, non experimentalem. At least in this thy day] The time of grace is fitly called a Day in regard of 1 Revelation. 2 Adornation. 3 Consolation. 4 Distinction. 5 Speedy preterition. Amend before the draw-bridge be taken up. No man can say, he shall have 12 hours to his day. But now they are hid from thine eyes:] Yet they lived under the Ministry long after, and no outward change to be discerned. As Plutarch writes of Hannibal, that when he could have taken Rome, he would not; when he would, he could not; so the Procrastinators.