Mysteries thus supplement rather than compete with civil religion. An individual could easily observe the rites of the state religion, be an initiate in one or more mysteries, and at the same time adhere to a certain philosophical school. Many of the aspects of public religion such as sacrifices, ritual meals, and ritual purification were repeated within the mystery, but with the additional requirement that they take place in secrecy and be confined to a closed set of initiates. The mystery schools offered a niche for the preservation of ancient religious ritual.