מַ֥עֲדֶה בֶּ֨גֶד ׀ בְּי֣וֹם קָ֭רָה חֹ֣מֶץ עַל־נָ֑תֶר וְשָׁ֥ר בַּ֝שִּׁרִ֗ים עַ֣ל לֶב־רָֽע׃ (פ)
As one that taketh off a garment in cold weather, and as vinegar upon nitre, So is he that singeth songs to a heavy heart.
Read kabbalistic (mystical) interpretation of Proverbs 25:20: and classical mystical sources.