Before conversion

Before conversion, the sinner is compared . . .
  to a stone for his hardness of heart (Zechariah 7:12),
  to a wolf for his savageness (Matthew 7:15)
  to a lion for his fierceness (Isaiah 11:6),
  to a bee for his sting (Psalm 118:12),
  to an adder for his poison (Psalm 140:3).

"And that is what some of you were! But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ!" 1 Corinthians 6:11

A hard heart is the anvil on which the hammer of God's justice will be striking to all eternity!