The Enlightenment and the Challenge to Orthodoxy

Historical Theology

Historical Setting

The eighteenth century called itself the Age of Reason, and Kant gave the movement its motto: Sapere aude — “Dare to know.” The Enlightenment was less a single doctrine than a temper of mind, a confidence that the human intellect, freed from the tutelage of tradition and church, could secure truth on its own. Newton’s physics had unveiled an orderly universe governed by discoverable laws. If nature ran by reason, why should religion not be brought to the same bar?

The challenge fell on a church that had grown weary of confessional warfare. The bloodletting of the Thirty Years’ War (1618–1648) had left many longing for a religion of reason and tolerance rather than dogma and division. Into that exhaustion the Enlightenment spoke with the promise of peace through reason. Its critique of orthodoxy was therefore not merely academic; it answered a real cultural hunger.

What Was at Stake

At stake was the very possibility of revealed religion. Historic Christianity rests on the claim that God has spoken — in the prophets, in the incarnate Son, in the Scriptures. The Enlightenment’s deepest challenge was to the category of revelation itself. If reason is autonomous and sufficient, then revelation is at best superfluous and at worst an imposition. The doctrines of the supernatural — miracle, incarnation, resurrection, inspiration — all hung in the balance.

Key Players

The deists trimmed Christianity to a “religion of nature”: one God, moral duty, and future judgment, with the miraculous and the dogmatic pared away. John Toland’s Christianity Not Mysterious (1696) set the tone — whatever in religion exceeded reason was to be discarded.

David Hume (1711–1776) pressed the sharpest knife. In his essay “Of Miracles,” he argued that the uniform experience of mankind establishes the laws of nature so firmly that no testimony to their violation could ever be credible; it is always more probable that the witness errs or deceives than that the miracle occurred. The argument has force: it appeals to ordinary canons of evidence and to our justified trust in natural regularity.

Immanuel Kant (1724–1804) relocated religion altogether. Having shown, to his own satisfaction, that pure reason cannot prove God, freedom, or immortality, he made these postulates of practical reason — necessary supports for the moral life. Religion became, in his famous phrase, a matter “within the bounds of reason alone,” reduced largely to ethics. Kant must be heard sympathetically: he sought not to destroy faith but to secure morality on an unshakable foundation.

Gotthold Ephraim Lessing (1729–1781) gave the age its most haunting image. Between the “accidental truths of history” and the “necessary truths of reason” there lay, he said, a “broad, ugly ditch” that he could not cross. How could the eternal salvation of the soul be made to depend on contingent reports of ancient events one cannot verify? The question is honest, and it still unsettles.

From these roots grew higher criticism. Julius Wellhausen’s documentary hypothesis dissected the Pentateuch into sources (J, E, D, P), denying Mosaic authorship and a unified composition. The quest for the historical Jesus, surveyed by Albert Schweitzer, sought to peel away the church’s “Christ of faith” to recover a merely human “Jesus of history.”

The Outcome

The Enlightenment did not abolish Christianity, but it permanently altered the terrain. Within the academy, the supernatural was placed on the defensive, and the burden of proof shifted onto the believer. Two broad responses emerged: accommodation (which would flower into liberal theology, see 06_03) and confessional defense (which would crystallize at Princeton, see 06_04). The lines drawn here would define theology for two centuries.

Scriptural Grounding

Scripture anticipates the collision between human wisdom and divine revelation, and does not flinch.

“Where is the one who is wise? Where is the scribe? Where is the debater of this age? Has not God made foolish the wisdom of the world?” (1 Corinthians 1:20)

“For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God.” (1 Corinthians 1:18)

The reality of miracle and the supernatural is not a peripheral concession but the spine of the gospel:

“And if Christ has not been raised, your faith is futile and you are still in your sins.” (1 Corinthians 15:17)

And revelation is presented not as a violation of reason but as its true illumination:

“In your light do we see light.” (Psalm 36:9)

Doctrinal Significance

The Enlightenment forced the church to articulate, more clearly than before, the relationship between reason and revelation. The Reformed answer is not that reason is worthless but that it is fallen — a created good now darkened by sin, in need of being captive to the Word of God. Reason serves under Scripture; it does not sit in judgment over it. This is the heart of the Reformed principium: Scripture is self-authenticating, its authority resting on God who is truth, witnessed to by the inward work of the Spirit.

“We may be moved and induced by the testimony of the Church to an high and reverent esteem of the Holy Scripture… yet, notwithstanding, our full persuasion and assurance of the infallible truth and divine authority thereof, is from the inward work of the Holy Spirit bearing witness by and with the Word in our hearts.” (WCF 1.5)

A Reformed Assessment — Wheat and Chaff

The wheat: the Enlightenment rightly exposed credulity, superstition, and the abuse of ecclesiastical authority. Its demand for honest evidence and clear thinking is no enemy of a faith that loves God with the mind. The Reformed tradition, with its high doctrine of providence and its confidence in an ordered creation, need not fear the study of nature or the careful examination of texts.

The chaff: the Enlightenment’s foundational error was the autonomy of reason — the assumption that the human mind is a neutral, self-sufficient judge. This is precisely what the fall denies. Hume’s argument against miracles quietly presupposes the very naturalism it claims to prove; it defines miracle out of existence rather than disproving it. Lessing’s ditch is real for autonomous reason, but the Spirit grants the believer assurance that no historian’s spade can supply. The quest for a Jesus stripped of the supernatural produced, as Schweitzer wryly observed, a figure reflecting each questioner’s own face.

Connections

This guide engages Bibliology (the authority and inspiration of Scripture) and Theology Proper (the doctrine of God against deism). It connects directly to WCF 1, especially 1.4–1.6 and 1.10, which locates final authority in “the Holy Spirit speaking in the Scripture.”

Backward, it stands against the Reformation’s recovery of sola Scriptura and the post-Reformation scholastics’ doctrine of the principia. Forward, the Enlightenment is the seedbed of liberal theology (06_03) and sets the stage for the great twentieth-century conflict, the Fundamentalist–Modernist controversy (07_01). Old Princeton’s defense of inerrancy (06_04) is the direct confessional answer to higher criticism, feeding forward into the inerrancy debates of the contemporary era (07_05).

Lessons for Today

The church today still faces Lessing’s ditch and Hume’s skepticism in new dress. We learn from this era to engage the critic charitably and on the merits, refusing both the anti-intellectualism that fears every hard question and the accommodation that surrenders the supernatural. Our confidence rests not on winning every philosophical argument but on the Spirit’s testimony to the Word — a foundation no Enlightenment can shake.