Gregory the Dialogist

If He withholdeth the waters, all things are dried up. If He sendeth them out, they will overturn the earth. If 'water' be understood of knowledge for preaching, as when it is written, The words of a man's mouth are as deep waters, and the well-spring of wisdom as an overflowing brook; when 'water is withheld, all is dried up,' in that if the knowledge of the preacher is withdrawn, the hearts of those that might have flourished in eternal hope, are forthwith 'dried up,' that they should remain in hopeless barrenness, whilst, in love …

Morals on the Book of Job, Book XI ↗

Thomas Aquinas

Then he shows how men can experience divine power in natural things, especially in rains and droughts. So he says, "If he will withhold the rain," so that it does not fall, "everything will dry up," which grows on the earth. "If he will send the rain," in great abundance, "it will cover the earth," as in floods. …

Commentary on Job ↗