Our trials are good because they show us our sin. Thomas Brooks explained this in his book, "The Mute Christian Under the Smarting Rod.” He speaks of how the trials, and then “the scum appears."
Few Christians see themselves and understand themselves rightfully. By trials, God reveals much of a man’s sinful self to his pious self. When the fire is put under the pot, then the scum appears. So when God tries a poor soul, Oh! how does…
...reveal itself in the heart of the poor creature?
Trials are God’s looking glass, in which His people see their own faults. Oh! that looseness, that vileness, that wretchedness, that sink of filthiness, that gulf of wickedness, which trials show to be in their hearts!
“Behold, I have refined thee, but not with silver; I have chosen thee in the furnace of affliction” (Isa 48:10)