Strictly speaking, each gospel and the book of Acts is arguably anonymous.[62] The Gospel of John is somewhat of an exception, although the author simply refers to himself as "the disciple Jesus loved" and claims to be a member of Jesus' inner circle.[63] The identities of each author were agreed upon at an early date, certainly no later than the early 2nd century. It is likely that the issue of the authorship of each gospel had been settled at least somewhat earlier,[64] as the earliest sources are in complete agreement on the issue.[65] No one questioned the early 2nd century consensus until the 18th century.[65]