The ancient world of Egypt, Greece, and Rome was home to a set of magical and spiritual technologies, called theurgy, that unite the practice of magic with the aims of religion. Theurgy, or "godwork," is the art of creating a stronger bond between the theurgist and his or her deities. The results of this stronger bond were imminently practical: stronger magic, more meaningful existence, and a better life. With the fall of Rome, these techniques...