“The crucible for silver and the furnace for gold, but the Lord tests the heart.” Proverbs 17:3 NIV
The crucible is a vessel used to melt the silver and gold so the impurities of the precious metal will rise to the top. When it does, the refiner will skim it off.
It is the same with your heart. The Great Refiner will use the hot fires of life to cause the impurities in your heart to be revealed so He can clear them out. In His kindness, He will bring to the surface the things that are holding you back. When He brings it to the surface, it means that you are ready to deal with it. Your job is to stay in His Hand, deal with what comes up (which almost always begins by forgiving yourself or others) and allow the healing balm of His love to make you new.
How is your heart?
What is Jesus bringing up?
What do you need to do with it?