There is pain, in this world, that once experienced leaves a permanent scar in our heart. We are changed for as long as we live. And though we walk through life, and laugh, and love; something of ourselves has been removed.
I believe, being Catholic, that when we talk about the peace of God; we are talking about that moment when God returns our hearts to the way they were before that pain. To those who have experienced such suffering, that alone would be salvation.