Proverbs 15:13 Kabbalah

לֵ֣ב שָׂ֭מֵחַ יֵיטִ֣ב פָּנִ֑ים וּבְעַצְּבַת־לֵ֝ב ר֣וּחַ נְכֵאָֽה׃

A merry heart maketh a cheerful countenance; But by sorrow of heart the spirit is broken.

Read kabbalistic (mystical) interpretation of Proverbs 15:13: and classical mystical sources.