Theophylact of Ohrid
Catena Aurea · Lukasevangelium 12
And he said also to the people, When ye see a cloud rise out of the west, straightway ye say, There cometh a shower; and so it is. And when ye see the south wind blow, ye say, There will be heat; and it cometh to pass. Ye hypocrites, ye can discern the face of the sky and of the earth; but how is it that ye do not discern this time? Yea, and why even of yourselves judge ye not what is right?
When He spoke about preaching, and called it a sword, His hearers may have been troubled, not knowing what He meant. And therefore our Lord adds, that as men determine the state of the weather by certain signs, so ought they to know His coming. And this is what he means by saying, When ye see a cloud rise out of the west, straightway ye say, There cometh a shower. And when ye see the south wind blowing, ye say, There will be heat, &c. As if He says, Your words and works shew me to be opposed to you. Ye may therefore suppose that I came not to give peace, but the storm and whirlwind. For I am a cloud, and I come out of the west, that is, from human nature; which has been long since clothed with the thick darkness of sin. I came also to send fire, that is, to stir up heat. For I am the strong south wind, opposed to the northern coldness.