What does Proverbs 3:20 mean?

Solomon extols God's knowledge by recalling that the Lord burst open reservoirs of water that were below the earth in the time of Noah. Genesis 7:11 reports that "in the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month, on that day all the fountains of the great deep burst forth, and the windows of the heavens were opened." In those days, unbelievers might have mocked Noah as he built an ark and preached. They felt safe. But in His knowledge the Lord burst the fountains of the deep and silenced Noah's critics.

Rain also serves as a reminder of how God's design, through His wisdom, accomplishes His will. When the Lord questioned Job, He asked: "Who has cleft a channel for the torrents of rain…to bring rain on a land where no man is, on the desert in which there is no man, to satisfy the waste and desolate land, and to make the ground sprout with grass?" (Job 38:25–27).