Luke 21:22, 27, 34-36

for these are days of vengeance [of rendering full justice or satisfaction], so that all things which are written will be fulfilled.

Then they will see THE SON OF MAN COMING IN A CLOUD with [transcendent, overwhelming] power [subduing the nations] and with great glory. [Dan 7:13, 14]

“But be on guard, so that your hearts are not weighed down and depressed with the giddiness of debauchery and the nausea of self-indulgence and the worldly worries of life, and then that day [when the Messiah returns] will not come on you suddenly like a trap; for it will come upon all those who live on the face of all the earth. But keep alert at all times [be attentive and ready], praying that you may have the strength and ability [to be found worthy and] to escape all these things that are going to take place, and to stand in the presence of the Son of Man [at His coming].”