For both the legalist and the lawbreaker, the experience of grace is agony. But it is a sweet agony for those who know they need it.
So: are we fundamentally self-presuming or fundamentally self-despairing? Is the world of grace a threat, or a liberation? Are we Javert or Valjean?
This will determine what happens when the agony of grace touches us, scalds us. This will determine our fate for all eternity.