Berean Standard Bible
Proverbs 20:27
“The spirit of a man is the lamp of the LORD, searching out his inmost being.”

In context
25It is a trap for a man to dedicate something rashly, only later to reconsider his vows.
26A wise king separates out the wicked and drives the threshing wheel over them.
27The spirit of a man is the lamp of the LORD, searching out his inmost being.
28Loving devotion and faithfulness preserve a king; by these he maintains his throne.
29The glory of young men is their strength, and gray hair is the splendor of the old.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).