It means his mercy is not calculating and cautious, like ours. It is unrestrained, flood-like, sweeping, magnanimous. It means our haunting shame is not a problem for him, but the very thing he loves most to work with. It means our sins do not cause his love to take a hit. Our sins cause his love to surge forward all the more. It means on that day when we stand before him, quietly, unhurriedly, we will weep with relief, shocked at how impoverished a view of his mercy-rich heart we had.