📖 Biblical Definition
Postmillennialism teaches that the Great Commission will succeed in discipling the nations, that the gospel will progressively transform cultures and societies, and that Christ will return to a largely Christianized world. It appeals to the parables of the mustard seed and leaven (Matthew 13:31-33) — small beginnings that pervade the whole. The kingdom of God grows until the stone cut without hands fills the whole earth (Daniel 2:35). Christ must reign "until he has put all his enemies under his feet" (1 Corinthians 15:25). Postmillennialism is optimistic about history because it is optimistic about the power of the gospel.
📜 Webster 1828 Definition
The term as a formal theological category was not yet in common use in 1828.
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MILLEN'NIUM, n. [L. mille, a thousand, and annus, year.] A thousand years; a word used to denote the thousand years mentioned in Revelation 20, during which some believe Christ will reign on earth with his saints. Note: Webster recognized the millennium debate. Postmillennialism places Christ's return after this period of gospel victory, in contrast to premillennialism which places it before.
📖 Key Scripture
• Matthew 13:31-33 — "The kingdom of heaven is like a grain of mustard seed... It is the smallest of all seeds, but when it has grown it is larger than all the garden plants."
• 1 Corinthians 15:25 — "He must reign until he has put all his enemies under his feet."
• Daniel 2:35 — "The stone that struck the image became a great mountain and filled the whole earth."
• Psalm 72:8-11 — "May he have dominion from sea to sea... May all kings fall down before him."
⚠️ Modern Corruption
Can devolve into utopianism, Christian nationalism, or triumphalism.
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Postmillennialism at its best produces gospel confidence and cultural engagement. At its worst, it produces triumphalism that confuses cultural Christianity with the kingdom of God, Christian nationalism that equates a particular political order with gospel victory, and utopianism that underestimates the persistence of sin and evil until Christ's return. The wheat and tares grow together until the harvest (Matthew 13:30). Paul warned of increasing apostasy in the last days (2 Timothy 3:1-5). Any eschatology that breeds complacency about sin or triumphalism about human progress has departed from the sobriety Scripture demands.
Usage
• "Postmillennialism takes the Great Commission seriously — it expects the gospel to actually succeed in discipling the nations before Christ returns."
• "The danger of postmillennialism is confusing cultural Christendom with the kingdom of God — Christianized societies are not the same as redeemed ones."