Therefore the Lord waits to be gracious to you, and therefore he exalts himself to show mercy to you. For the Lord is a God of justice; blessed are all those who wait for him.—Isaiah 30:18  John Piper’s introduction and conclusion of a sermon, “Battling the Unbelief of Impatience,” Impatience is a form of unbelief. … More Piper: Impatience is a form of unbelief.