God refines with afflictions, trials, and tribulations, the heat of which separates impurities such as unforgiveness, strife, bitterness, anger, envy, and so forth from the character of God in our lives. Sin easily hides where there is no heat of trials and afflictions. In times of prosperity and success, even a wicked man will seem kind and generous. Under the heat of trials, however, the impurities surface.
Trials either are the furnace to separate impurities from us, or we simply descend into our impurities