Several years ago Sr. Jean recommended Henri Nouwen's book The Return of the Prodigal Son and I've finally read it. I, too, HIGHLY recommend it. A brief taste:

I am beginning to see that much of praying is grieving. This grief is so deep not just because the human sin is so great, but also -- and more so -- because the divine love is so boundless. To become like the Father whose only authority is compassion, I have to shed countless tears and so prepare my heart to receive anyone, whatever their journey has been, and forgive them from that heart.