Reference for Proverbs 14:10

לֵ֗ב י֭וֹדֵעַ מָרַּ֣ת נַפְשׁ֑וֹ וּ֝בְשִׂמְחָת֗וֹ לֹא־יִתְעָ֥רַב זָֽר׃

The heart knoweth its own bitterness; And with its joy no stranger can intermeddle.