Shoot forth (προβαλωσιν). Second aorist active subjunctive of προβαλλω, common verb, but in the N.T. only here and Ac 19:33.

The Son of man coming in a cloud with power and great glory. And when these things begin to come to pass, then look up, and lift up your heads;…

St. Gregory the Great: Having previously spoken against the wicked, He now turns His words to the consolation of the elect. For…

When they now shoot forth Their buds, branches, and leaves; the Vulgate Latin adds, "of themselves": you see …

Christ tells His disciples to observe the signs of the times, by which they could judge. He charges them to consider the ruin of the Jewish nation …