Here's a story from the desert tradition: A brother had committed a fault and was called before the council. The council invited the revered Abba Moses to join, but Abba Moses refused. They sent someone to get him, and he agreed to come. He took a leaking jug, filled it with water and carried it with him to the council. They saw him coming with the jug leaving a trail of water, and asked, "What's this?" Abba Moses said, "My sins run out behind me and I do not see them, and today I am coming to judge the error of another?" When the council heard these words they forgave the brother.
In solitude before God, faced only with ourselves, we learn the compassion of God. Perhaps it is not incidental that in the midst of ministry and the unrelenting needs of the crowd, Jesus, the good shepherd, called his disciples to join him in the desert: "Come away to a deserted place all by yourselves and rest awhile."
It is not all rest, all shabbat in the wilderness. There, wrestling with our own hearts in the darkness before God, we learn mercy the shepherd's prerequisite and become a people of compassion.