Theophylact of Ohrid
Catena Aurea · Lukasevangelium 21
And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring; Men’s hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken. And then shall they see the Son of man coming in a cloud with power and great glory.
But not only shall men be tossed about when the world shall be changed, but angels even shall stand amazed at the terrible revolutions of the universe. Hence it follows, And the powers of heaven shall be shaken.