A rabbinic paraphrase of the second clause is: “Lowly souls become full of wisdom as the low place becomes full of water.”

Then cometh shame. —For they have not the grace of God to keep them from falling. (See above on Proverbs 6:17.)

[When] pride comes, then comes shame
The one follows the other, or rather keep pace together; as soon as one comes, …

Considering how safe, and quiet, and easy the humble are, we see that with the lowly is wisdom.