In making weapons, why is it that there's still the process of heating the metal? It's because any impurity in the metal can make faulty weapons. Any amount of slag in the metal can create a sword that easily breaks. To get rid of the impurity there is the need for high heat. No high heat then no getting rid of such impurities. If you don't want to pass through trials and temptations then how can you show how God works?
Melting down Christians may involve God taking away material blessings, friends and whatever may be hindering His children from doing better. The fire of affliction is not there to destroy the Christian but to make them better. The refining process may be painful as it will also involve persecutions and slanders but as God melts down the Christian and reforms them, the more impurities are cast out as a result.
God Makes Christians Better Through Suffering