וְֽלֹא־יָ֭דַע כִּֽי־רְפָאִ֣ים שָׁ֑ם בְּעִמְקֵ֖י שְׁא֣וֹל קְרֻאֶֽיהָ׃ (פ)
But he knoweth not that the shades are there; that her guests are in the depths of the nether-world.
Read Jewish philosophical commentary on Proverbs 9:18: and classical philosophical sources.