John Wesley on Revelation 16:8

The fourth poured out his phial upon the sun - Which was likewise affected by the fourth trumpet. There is also a plain resemblance between the first, second, and third phials, and the first, second, and third trumpet. And it was given him - The angel. To scorch the men - Who had the mark of the beast. With fire - As well as with the beams of the sun. So these four phials affected earth, water, fire, and air.