Ortlund usefully develops four tiers in his theological-triage system: (1) doctrines that are essential to the gospel; (2) doctrines that are urgent for the health and practice of the church, such that Christians commonly divide denominationally over them; (3) doctrines that are important for one branch of theology or another, but not such that they should lead to separation; (4) doctrines that are unimportant to gospel witness and ministry collaboration.
