Then the scum appears!

("The Mute Christian Under the Smarting Rod"
 or, "The Silent Soul with Sovereign Antidotes"
 by Thomas Brooks, 1659, London.)

Few Christians see themselves and understand
themselves rightfully. By trials, God discovers
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 . . .
  the scum of pride,
  the scum of murmuring,
  the scum of distrust,
  the scum of impatience,
  the scum of worldliness,
  the scum of carnality,
  the scum of foolishness,
  the scum of willfulness--
discover 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!

"I have tested you in the furnace of affliction."
     Isaiah 48:10