The Erastian Question
Does ecclesiastical jurisdiction belong to the church or to the civil magistrate?
Alternative rejected
Background
Thomas Erastus (1524-1583), a Heidelberg physician and theologian, had argued in *Explicatio Gravissimae Quaestionis* (published posthumously 1589) that the church has no proper jurisdiction distinct from the civil magistrate's. Ecclesiastical discipline, Erastus held, is a function of the Christian state, not of a distinct ecclesial court. The position had been Henry VIII's in England (in modified form) and Zwingli's in Zurich; it had supporters at Westminster among the lay assessors — Selden, Lightfoot, Coleman, Whitelocke — and threatened to derail the Presbyterian polity settlement at the highest level.
The Assembly’s handling
The Erastian question came to a head in the July 1645 sessions and ran through to November. Selden was the most formidable Erastian voice — his learning on the Sanhedrin and Hebrew law made him a uniquely difficult opponent — and Lightfoot pressed the case from the ministerial side with Coleman's support. Thomas Coleman's parliamentary sermon of 30 July 1645 (*A Brotherly Examination Re-examined*) was the public manifesto. Gillespie's reply, the great *Aaron's Rod Blossoming* (1646), is the canonical Reformed refutation: Christ has positively instituted a government in the church distinct from the civil magistrate's. Rutherford's *Divine Right of Church Government* (1646) supplied the systematic backing. The Assembly voted against Erastianism; the Form of Government and WCF XXX.1 secured the church's independent jurisdiction. Selden lost; Lightfoot kept his attendance and vote.
Parties
The anti-Erastian majority
Christ has positively instituted a government in the church distinct from the civil magistrate's. Ecclesiastical jurisdiction (admission, censure, excommunication) belongs to officers in the church, not to the magistrate.
- George Gillespie (1613–1648)
- Samuel Rutherford (c. 1600–1661)
- Alexander Henderson (1583–1646)
- Edmund Calamy the Elder (1600–1666)
- Thomas Goodwin (1600–1680)
- Edward Reynolds (1599–1676)
The Erastians
Ecclesiastical jurisdiction belongs ultimately to the Christian magistrate, not to a distinct ecclesial court. The church's officers may execute discipline but only as agents of the magistrate; excommunication is a civil power.
- John Selden (1584–1654)
- John Lightfoot (1602–1675)
- Thomas Coleman (1598–1646)
- Bulstrode Whitelocke (1605–1675)
Confessional language
WCF XXX.1: 'The Lord Jesus, as King and Head of his Church, hath therein appointed a government, in the hand of Church officers, distinct from the civil magistrate.' WCF XXXI.5: 'Synods and councils are to handle, or conclude nothing, but that which is ecclesiastical: and are not to intermeddle with civil affairs which concern the commonwealth…'
Ontology placement
This crux bears on the following attributes of the Westminster ontology. The Westminster baseline value is marked WCF.
VII · Ecclesiology & Worship · Polity
VII · Ecclesiology & Worship · Censures & Synods
VIII · Civil & Last Things · Magistrate's Role
Legacy
Gillespie's *Aaron's Rod Blossoming* (1646) remained the Reformed standard refutation of Erastianism through the 18th and 19th centuries. The Scottish Disruption of 1843 — the Free Church of Scotland's secession over patronage and state interference — turned on whether the Court of Session had Erastianised the established church. The American 1788 revision of WCF XXIII rewrote the magistrate clauses for a disestablished context but kept XXX.1's distinct-jurisdiction language intact. Modern church-state debates in Reformed circles still cite the Westminster anti-Erastian settlement.