The refining pot is for silver and the furnace for gold, but the Lord tries the hearts.
(Proverbs 17:3 AMP)
Blacksmith’s use the heat of the flame to their advantage when working with precious metals. The furnace melts the hard metal into a liquid form causing the impurities hidden deep within to arise to the surface for removal. The Lord uses difficult life situations as a fiery furnace when working with the precious hearts of His children. The flames of personal conflict melt away the hardness of our hearts causing unrighteousness thoughts or behaviors to arise to a conscious level of awareness for removal through repentance.