📖 Biblical Definition
Greek suneidesis, conscience, the moral consciousness by which the human creature knows-along-with-God the moral quality of his thoughts and actions. The compound structure (sun, with + oida, to know) carries the substantive sense of co-knowledge: the conscience is the inner witness by which the creature shares God's moral assessment of his own conduct. The NT theology of suneidesis is rich and pastorally significant. Paul speaks of the unbelieving Gentiles whose conscience bears witness to the law written on their hearts (Romans 2:14-15); of his own labor to maintain a conscience void of offence toward God, and toward men (Acts 24:16); of the importance of preserving a good conscience in the life of the believer (1 Timothy 1:5, 19; 3:9; Hebrews 13:18; 1 Peter 3:16, 21); of the weak conscience that scruples over matters indifferent (1 Corinthians 8:7-13; 10:25-29; Romans 14); of the seared conscience of the hypocrite (1 Timothy 4:2, having their conscience seared with a hot iron); of the cleansed conscience of the believer washed by the blood of Christ (Hebrews 9:14, how much more shall the blood of Christ... purge your conscience from dead works to serve the living God; 10:22, having our hearts sprinkled from an evil conscience). The Reformed-confessional tradition's pastoral casuistry (Perkins, Ames, Baxter, the entire cases of conscience literature) develops the practical wisdom for the believer's conscience-formation and the resolution of conscience-cases. The patriarchal-Reformed reader recovers suneidesis as the moral co-knowledge faculty given by God, distorted by sin, cleansed by Christ's blood, instructed by Scripture, and forming the believer's faithful walk before the Lord.
📜 Webster 1828 Definition
Greek suneidesis (G4893), conscience / co-knowledge; the moral faculty by which the creature knows-along-with-God the quality of his thoughts and actions; cleansed by Christ's blood (Hebrews 9:14).
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SYNEIDESIS, Greek noun (G4893; conscience, moral consciousness) From sun (with) + oida (to know); literally co-knowledge. The moral faculty by which the creature knows-along-with-God the moral quality of his thoughts and actions. NT theology: Gentiles' conscience witnessing the law written on hearts (Romans 2:14-15); Paul's conscience void of offence (Acts 24:16); the good conscience in the believer's life (1 Timothy 1:5, 19; 3:9; Hebrews 13:18; 1 Peter 3:16, 21); the weak conscience scrupling at indifferent matters (1 Corinthians 8; Romans 14); the seared conscience of the hypocrite (1 Timothy 4:2); the cleansed conscience of the believer (Hebrews 9:14; 10:22). Reformed casuistry: Perkins, Ames, Baxter.
📖 Key Scripture
Romans 2:14-15 — "For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness."
Hebrews 9:14 — "How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?"
1 Timothy 1:5 — "Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned."
Acts 24:16 — "And herein do I exercise myself, to have always a conscience void of offence toward God, and toward men."
⚠️ Modern Corruption
No major postmodern redefinition. The principal contemporary mishandling is the modern reduction of conscience to subjective feeling or cultural conditioning, losing the substantive co-knowledge-with-God force of biblical suneidesis.
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Suneidesis as a Greek term does not undergo lexical corruption. The principal contemporary mishandling is the modern reduction of conscience to subjective feeling, cultural conditioning, or evolutionary instinct. The biblical suneidesis is the opposite: a real faculty by which the creature shares God's moral assessment of his thoughts and actions. The conscience can be misinformed, ignored, seared, defiled, or cleansed; but it is objectively a real faculty oriented to the LORD's moral law. The patriarchal-Reformed recovery is the integrated biblical doctrine: the conscience is the divinely given moral faculty; it requires Scripture-informed instruction; it is cleansed by Christ's blood; the believer's life under grace involves the careful cultivation of a good and clean conscience before God and men.
🔗 Greek & Hebrew Roots
G4893; sun + oida; co-knowledge with God of moral quality of thoughts and actions.
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['Greek', 'G4893', 'suneidesis', 'conscience, moral consciousness']
['Greek', 'G4862', 'sun', 'with']
['Greek', 'G1492', 'oida', 'to know, see']
Usage
"Suneidesis: conscience; the moral co-knowledge faculty."
"Cleansed by Christ's blood (Hebrews 9:14)."
"Reformed casuistry develops the practical wisdom of conscience-formation and case-resolution."