A person’s soul should be clean, like a mirror reflecting light. If there is rust on the mirror his face cannot be seen in it. In the same way, no one who has sin within him can see God. But if you will you can be healed. Hand yourself over to the doctor, and he will open the eyes of your mind and heart. Who is to be the doctor? It is God, who heals and gives life through his Word and wisdom.
–Saint Theophilus of Antioch (Second Century)