📖 Biblical Definition
Scripture affirms the value of reason -- God gave us minds and commands us to use them (Isaiah 1:18: "Come now, let us reason together"). But reason is a tool, not a throne. The biblical order is revelation first, reason second: we think God's thoughts after Him. Rationalism inverts this order, making human reason the judge of God's Word rather than the servant of it. Paul warned against this: "Has not God made foolish the wisdom of the world?" (1 Corinthians 1:20). The fall damaged human reason along with every other human faculty. Unaided reason is not a neutral instrument -- it operates under the noetic effects of sin. "The natural person does not accept the things of the Spirit of God, for they are folly to Him" (1 Corinthians 2:14). Reason redeemed by God is powerful; reason enthroned above God is idolatry.
📜 Webster 1828 Definition
The doctrine or system of those who deduce their religious opinions from reason alone, without the aid of revelation.
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RA'TIONALISM, n. The doctrine or system of those who deduce their religious opinions from reason or the understanding, without the aid of revelation. Note: Webster clearly saw rationalism as a theological threat -- the attempt to build religion on human reason alone, discarding divine revelation. He recognized this as fundamentally incompatible with Christianity, which is built on "Thus says the LORD."
📖 Key Scripture
• 1 Corinthians 1:20-21 — "Has not God made foolish the wisdom of the world?"
• Proverbs 3:5-6 — "Trust in the LORD with all your heart, and do not lean on your own understanding."
• Isaiah 55:8-9 — "For as the heavens are higher than the earth, so are my ways higher than your ways."
• Colossians 2:8 — "See to it that no one takes you captive by philosophy and empty deceit."
⚠️ Modern Corruption
Rationalism produced liberal theology, which subjects every doctrine to the tribunal of human reason.
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Rationalism is the father of liberal theology. Beginning with the Enlightenment, theologians began subjecting Scripture to the judgment of reason: miracles were dismissed as mythological, the resurrection was reinterpreted as symbolic, and the supernatural was systematically removed from Christianity. What remained was a moral philosophy -- a religion of human reason dressed in Christian terminology. This continues today in mainline denominations that reject the authority of Scripture wherever it conflicts with modern sensibilities. The rationalist says "I will believe what my reason approves." The Christian says "I will believe what God has said, and use my reason to understand and apply it."
Usage
• "Rationalism enthrones human reason above divine revelation -- Proverbs 3:5 says 'do not lean on your own understanding.'"
• "The Enlightenment's gift to theology was rationalism: the project of removing from Christianity everything that human reason finds uncomfortable."
• "Using reason to understand Scripture is wisdom; using reason to judge Scripture is rationalism."