See also: Erastianism
📖 Biblical Definition
Erastianism is the doctrine that subordinates the church to the civil magistrate, making the state supreme even in ecclesiastical and spiritual matters—most pointedly in the power of discipline and admission to the sacraments. In its developed form it denies that the church possesses any independent, divinely given jurisdiction; the keys are effectively handed to the prince, who governs the church as a department of the commonwealth, appoints or controls her officers, and reserves to himself the right of censure and excommunication. The position takes its name from Thomas Erastus, who argued against the Reformed practice of excommunication, holding that the punishment of offenders belonged to the magistrate. Presbyterians and other Reformed confessions reject Erastianism root and branch, contending that Christ alone is King and Head of His church, that He has given to her officers—not to the magistrate—the spiritual power of the keys, and that the two kingdoms, civil and ecclesiastical, are distinct in their nature, their ends, and their instruments. The civil ruler bears the sword for the common good and may and ought to protect and nurture true religion; but he may not usurp the throne of Christ in His own house, govern her worship, or wield her discipline. The Westminster divines fought this battle directly, and the doctrine of the church’s independent spiritual jurisdiction was one of the great fruits of that struggle.
📜 Webster 1828 Definition
Webster 1828 defines ERASTIAN as a follower of Erastus, who held that the church has no power of discipline independent of the civil magistrate, and ERASTIANISM as their principles.
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ERASTIAN, n. — One of the sect of Erastus, who denied to the church any power of discipline or excommunication, and made it dependent on the civil magistrate.
ERASTIANISM, n. — The principles of the Erastians, who maintained that the discipline of the church belongs wholly to the civil power.
📖 Key Scripture
Isaiah 33:22 — "For the Lord is our judge, the Lord is our lawgiver, the Lord is our king; he will save us."
Ephesians 1:22 — "And hath put all things under his feet, and gave him to be the head over all things to the church."
Colossians 1:18 — "And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence."
Matthew 22:21 — "Render therefore unto Caesar the things which are Caesar’s; and unto God the things that are God’s."
⚠️ Modern Corruption
No major postmodern redefinition; Erastianism itself is the error. Its modern form is the state church that bends doctrine and discipline to the government’s will, and the church that surrenders her jurisdiction to courts and culture.
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Erastianism is not a corruption of a good doctrine but is itself the error—the surrender of Christ’s crown rights over His church into the hands of the civil power. Its classic form was the established state church in which the magistrate appointed bishops, controlled councils, and reserved to himself the final word on doctrine and discipline, so that the church became a chaplaincy of the state rather than the kingdom of Christ. The Reformed and especially the Presbyterian tradition resisted this at great cost, insisting that the Lord is our lawgiver and king, that He alone is Head of the church, and that the keys He gave to His officers may not be confiscated by any prince.
The modern face of Erastianism is subtler but no less real. It appears wherever a church bends her doctrine, her discipline, or her ordination to the demands of the civil courts and the surrounding culture—trimming her confession to keep her tax status, redefining her standards to match the law of the land, surrendering her right to govern her own membership to the dictates of the state. To capitulate thus is to confess, in deed if not in word, that Caesar and not Christ is head of the church. The remedy is the ancient one: render to Caesar what is Caesar’s, and to God—including the government of His own house—what is God’s.
🔗 Greek & Hebrew Roots
The doctrine is answered by the biblical confession of Christ as sole king, head, and lawgiver of His church, over against any claim of civil supremacy in spiritual things.
Usage
"Erastianism hands the keys of the church to the magistrate; the Reformed answer that Christ alone is her king and head."
"The Westminster divines fought Erastianism to win the church’s independent power of discipline."
"A church that trims her confession to please the state has embraced a quiet Erastianism, whatever her creed says."