Why a furnace?

The refining in a furnace is the same as walking closer to God. Either way impurities, non-essentials, ungodly attributes are burnt away, peeled away until you become more and more like His glorious Son (The Bright and Morning Star) who is our Lord Jesus the Christ. See Isaiah 48:10 Behold, I have refined you, but not as silver, I have tested you in the furnace of affliction. The question is why does God do this or allow this? Isaiah 48:11 says, “For My own sake, for My own sake, I will do it; For how should My (God’s) name be profaned? And I will not give My glory to another.