שִׂפְתֵ֣י צַ֭דִּיק יִרְע֣וּ רַבִּ֑ים וֶֽ֝אֱוִילִ֗ים בַּחֲסַר־לֵ֥ב יָמֽוּתוּ׃
The lips of the righteous feed many; But the foolish die for want of understanding. .
Read Kabbalistic (mystical) interpretations of Proverbs 10:21: Zohar and classical Jewish mystical sources, free online.