מַצְרֵ֣ף לַ֭כֶּסֶף וְכ֣וּר לַזָּהָ֑ב וְ֝אִ֗ישׁ לְפִ֣י מַהֲלָלֽוֹ׃
The refining pot is for silver, and the furnace for gold, And a man is tried by his praise.
Read Jewish philosophical commentary on Proverbs 27:21: and classical philosophical sources.