What do you think about this Bible verse?: Malachi 3:3 "He sits as a refiner and purifier of silver".

The verse puzzled a church group, they wondered what it said of God's character and nature. A women offered to find out the process of refining silver and tell them at the next study. She called a silversmith and asked to see him work. She mentioned no reason of interest beyond curiosity. As she watched, he held a piece of silver over the fire to heat up. He said "To refine silver, you need to hold it in the middle where the flame is hottest, to burn away all the impurities." She thought of God holding us in such a spot, then again about the verse. She asked if he had to sit in front of the fire the whole time. He said "Yes, not only sit here holding the silver but also watch, if it's left a moment too long in the fire, it will be destroyed." She was quiet for a moment. Then asked how he knew when the silver was fully refined. He smiled, "Easy: when I see my image in it" If you feel the heat of the fire, know God has His eye on you and will keep watching until He sees His image in you.