Summarized

The Shepherd of Hermas is an early Christian text that was popular but ultimately not included in the New Testament. Written in Rome, it takes the form of visions, mandates, and similitudes, often presented as a dialogue between the author, Hermes, and an angel called the shepherd. The text is notable for its length, unique Christology (where the Holy Spirit is the beloved Son and the Son of God is a diligent slave who earns co-heir status), and emphasis on observing commandments and performing good works for salvation, contrasting with Pauline teachings of salvation by faith alone.

It also highlights the importance of baptism for new life but stresses the need for a spotless life afterward, a view that led some early Christians to delay baptism. The Shepherd of Hermas provides insight into the diverse beliefs and practices of early Christian communities, showing a different path than what eventually became Orthodox Christianity. Its lack of apostolic attribution and its distinctive theological ideas likely contributed to its exclusion from the canon, despite its popularity.