הִנֵּ֥ה צְרַפְתִּ֖יךָ וְלֹ֣א בְכָ֑סֶף בְּחַרְתִּ֖יךָ בְּכ֥וּר עֹֽנִי׃
Behold, I have refined thee, but not as silver; I have tried thee in the furnace of affliction.
Read Jewish philosophical commentary on Isaiah 48:10: and classical philosophical sources.