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.
Or else, When the higher world shall be changed, then also the lower elements shall suffer loss; whence it follows, And on the earth distress of nations, &c. As if He said, the sea shall roar terribly, and its shores shall be shaken with the tempest, so that of the people and nations of the earth there shallbe distress, that is, a universal misery, so that they shall pine away from fear and expectation of the evils which are coming upon the world.