Exposition on the Psalms of David
Here he treats of the third change. And first, of thunder. Second, of lightning, at "he sent his arrows." It should be known that the Psalmist speaks here according to this likeness: that whatever happens in the sky is attributed to God. Hence he takes the sound heard in the sky as though it were the voice of God. Now there is a twofold sound in the sky. One is thunder; and this, although some say it is the extinction of fire in a cloud, the Psalmist rejects and says it is produced by the clash of winds -- and so also are the clouds. And therefore the Psalmist says, "The Lord thundered from heaven." Also, sometimes thick clouds from which hailstones are generated sometimes produce a sound; hence the Philosopher says that sometimes before hail there is a crashing of clouds, sometimes not. For just as a hot and dry vapor expelled by the cold, splitting the cloud, makes a sound, as is evident in lightning, so a moist vapor congealed into hail and expelled by the heat splits it to some degree and makes a sound. And therefore he says, "The Most High gave forth his voice," that is, he manifested his power. And there follows, "hail and coals of fire," which are generated from these clouds, as was said. Or thus, "he thundered from heaven." Note that sometimes moist vapor ascends to a higher place; and because it is of the nature of water, moist impressions are made from it, which are fog, dew, haze, rain, hail, snow, and the like. Now these are diversified sometimes by diversity with respect to the thinness and thickness of heat and cold. For sometimes dry vapor ascends; and if it alone ascends, it makes winds; but if that dry vapor is contained in moist vapor, then when the moist vapor ascends upward and begins to thicken because of the cold, the dry vapor enclosed in that moist vapor causes great agitation and is inflamed -- for such vapor is quickly inflamed, as can be seen in vapor that comes from a person's belly -- and this inflammation is the cause of lightning and flashing. Now the dry vapor, agitated in the interior of the clouds, makes a manifold sound. Also, if thus inflamed it strikes the sides of the cloud and does not split it, then it gleams but not clearly, just as if someone were to see some brightness through a cloth; for the cloud is somewhat transparent, hence it is somewhat visible. And it sounds like the sound of a flame in the middle of a fire. Sometimes also, without inflammation and consequently without flashing, there is a sound, as if rumbling; and this happens when it strikes, uninflamed, the sides of the cloud. But if it strikes the sides and splits them, yet with some difficulty, and this in the thicker part of the cloud, then there is a terrible sound, as if someone were tearing a cloth of immense width; and then the appearance of the lightning or flashing is curved, because it does not go straight out of the cloud, as was said. Sometimes it splits the cloud with great force and almost instantly, and all the vapor goes out at once; and then it sounds like an inflated bladder, or as if a blown-up bag were burst over someone's head, and it strikes the air with the strongest percussion. Sometimes that dry vapor increases from inflation and, seeking a larger place, causes the cloud to dissolve suddenly, sounding like green wood crackling in fire, or especially like eggs; and this is most apparent in chestnuts, which, when placed in fire and the moisture begins to be released and seeks a larger place, break the resisting shell and exit with force and a great sound. Sometimes also, unable to exit, it is extinguished; and it sounds like red-hot iron extinguished in water, which sound the Philosopher calls "hissing" or "sizzling." Sometimes also that vapor makes various openings in the thinner parts of the cloud, and then it makes a kind of whistling sound, like wind when it exits through openings. Sometimes before it is kindled it bursts from the cloud, and then it sounds like blacksmith's bellows when they blow.
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