שְׁא֣וֹל וַ֭אֲבַדּוֹן נֶ֣גֶד יְהוָ֑ה אַ֝֗ף כִּֽי־לִבּ֥וֹת בְּֽנֵי־אָדָֽם׃
The nether-world and Destruction are before the LORD; How much more then the hearts of the children of men!
Rashi on Proverbs
The grave and Destruction are opposite the Lord It is revealed to Him all that are therein.
Rashi on Proverbs
surely people’s hearts This is an inference from a major to a minor.