Proverbs 14:13 Kabbalah

גַּם־בִּשְׂח֥וֹק יִכְאַב־לֵ֑ב וְאַחֲרִיתָ֖הּ שִׂמְחָ֣ה תוּגָֽה׃

Even in laughter the heart acheth; And the end of mirth is heaviness.

Read kabbalistic (mystical) interpretation of Proverbs 14:13: and classical mystical sources.