Christadelphians firmly hold that the biblical canon is closed and that no new revelation from God supplements or supersedes Scripture. The gifts of prophecy, tongues, and miraculous healing described in the New Testament were temporary gifts given to establish the early church, not permanent gifts continuing in the present. All doctrinal claims must be tested by and grounded in the written Scriptures.

This cessationist position on miraculous gifts distinguishes Christadelphians from Pentecostal and charismatic Christianity. Christadelphians are skeptical of claims to ongoing prophetic revelation and regard charismatic experiences as either self-generated enthusiasm or, at worst, deception. The Bible provides everything necessary for salvation and right living (2 Timothy 3:16-17), making additional revelation unnecessary.

The Christadelphian community's strong emphasis on personal and communal Bible study, detailed exegesis, and doctrinal precision is partly a consequence of their cessationism: since no new revelation is available, all guidance must come from careful study of the existing written Word. This gives Christadelphian spiritual life a markedly intellectual and text-focused character compared to experience-oriented Christian movements.