In the process of refining metals, the raw metal is heated with fire until it melts. The impurities separate from it and rise to the surface. They are skimmed off leaving the pure metal. Without this heating and melting, there would be no purifying. As the impurities are skimmed off the top, the reflection of the worker appears in the smooth pure surface. As we are purified by God, His reflection in our lives will become more and more clear.
1 Peter 1:6-7 – In this you greatly rejoice, though now for a little while you may have had to suffer grief in all kinds of trials. These have come so that your faith, of greater worth than gold, which perishes even though refined by fire, may be proved genuine and may result in praise, glory and honor when Jesus Christ is revealed.