What Is Theology & Why Study It?

"The fear of the LORD is the beginning of wisdom, and the knowledge of the Holy One is understanding." — Proverbs 9:10

Defining Theology

The word theology derives from two Greek roots: theos (θεός, "God") and logos (λόγος, "word, reason, discourse"). At its simplest, theology is discourse about God — the disciplined, reverent, and rational study of the nature, attributes, works, and will of the living God as He has made Himself known.

But this simple etymology conceals a profound tension. Can finite creatures truly have knowledge of the infinite Creator? The Christian tradition has always answered with a qualified yes — not because human reason is sufficient to scale the heights of divine being, but because God has graciously condescended to reveal Himself. Theology is possible only because God has spoken. As John Calvin wrote in the opening pages of his Institutes of the Christian Religion (1559): "Nearly all the wisdom we possess, that is to say, true and sound wisdom, consists of two parts: the knowledge of God and of ourselves" (I.i.1).

Archetypal and Ectypal Theology

The Reformed scholastic tradition, particularly through the work of Franciscus Junius (1545–1602) and later Herman Bavinck (1854–1921), developed a crucial distinction that every theology student must grasp:

Theologia archetypa (archetypal theology) is God's own perfect, exhaustive self-knowledge — the way God knows Himself. This knowledge is infinite, simple, and identical with God's own being. It is not something we can attain or replicate; it belongs to God alone.

Theologia ectypa (ectypal theology) is the knowledge of God that creatures possess by virtue of God's self-revelation. It is true knowledge — genuinely corresponding to the reality of who God is — but it is accommodated knowledge, fitted to our creaturely capacity. Ectypal theology subdivides further into:

• Theologia viatorum — the theology of pilgrims (viatores), that is, of believers in this present age who know God through Scripture, creation, and the work of the Spirit, but who see "through a glass, darkly" (1 Corinthians 13:12).
• Theologia beatorum — the theology of the blessed in glory, who see God face to face yet still know Him as creatures, not as He knows Himself.

This distinction is not mere academic hair-splitting. It establishes a foundational humility: our theology is real knowledge of God, but it is not God's own knowledge of Himself. We know truly, but not exhaustively. As Moses declared, "The secret things belong unto the LORD our God: but those things which are revealed belong unto us and to our children for ever" (Deuteronomy 29:29).

Why Study Theology?

1. Because God Commands It

The greatest commandment is to "love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind" (Matthew 22:37, emphasis added). Theology is the intellectual dimension of loving God. The Apostle Peter commands believers to "be ready always to give an answer to every man that asketh you a reason of the hope that is in you" (1 Peter 3:15). This requires disciplined study.

2. Because All People Are Theologians

As R.C. Sproul (1939–2017) famously observed, "Everyone's a theologian. The question is whether you are a good one or a bad one." Every human being holds beliefs about God — whether that God exists, what God is like, what God requires. The only question is whether those beliefs are informed by careful attention to God's Word or by careless assumptions and cultural drift.

3. Because Error Is Deadly

The history of the church demonstrates that doctrinal error produces pastoral catastrophe. The Arian heresy of the fourth century — which denied the full deity of Christ — threatened to overturn the Gospel itself. It was the careful theological work of Athanasius of Alexandria (c. 296–373), standing contra mundum ("against the world"), that preserved the Nicene confession of Christ's eternal deity. Bad theology leads people away from the true God; good theology leads them toward Him.

4. Because Theology Grounds All Other Knowledge

Proverbs 1:7 declares, "The fear of the LORD is the beginning of knowledge." This is not merely a pious slogan — it is an epistemological claim. The fear of God is the foundational posture from which all genuine understanding flows. Mathematics, science, history, language — every discipline is a study of some aspect of God's creation and is therefore a subset of the theological enterprise. As Abraham Kuyper (1837–1920) proclaimed, "There is not a square inch in the whole domain of our human existence over which Christ, who is Sovereign over all, does not cry, 'Mine!'"

The Loci of Systematic Theology

Systematic theology organizes the teaching of Scripture into coherent loci (topics or "places"). While different theologians arrange these differently, the classical Protestant order generally proceeds:

1. Prolegomena — The study of theology itself: its nature, possibility, sources, and method (our present unit)
2. Theology Proper — The doctrine of God: His existence, attributes, Trinity
3. Anthropology — The doctrine of humanity: creation, image of God, the fall
4. Christology — The doctrine of Christ: His person (two natures) and work (atonement)
5. Soteriology — The doctrine of salvation: election, calling, justification, sanctification
6. Pneumatology — The doctrine of the Holy Spirit
7. Ecclesiology — The doctrine of the Church
8. Eschatology — The doctrine of last things: return of Christ, resurrection, judgment, new creation

These loci are not independent silos but an interconnected whole — what Bavinck calls a "beautiful organic unity." To understand salvation, one must understand who God is, who humans are, and who Christ is. Theology is systematic precisely because the God it studies is a God of order (1 Corinthians 14:33).

The Fear of the LORD as Theological Foundation

We return to our opening text: "The fear of the LORD is the beginning of wisdom" (Proverbs 9:10). The Hebrew word for "fear" here is yir'ah (יִרְאָה), encompassing awe, reverence, holy dread, and worshipful submission. This fear is not servile terror but filial reverence — the trembling delight of a creature before its infinite, holy, and gracious Creator.

Augustine of Hippo (354–430) opened his Confessions with the prayer: "Thou hast made us for Thyself, and our hearts are restless until they rest in Thee." The study of theology is not a detached academic exercise; it is the restless heart finding its rest in the knowledge of God. Every definition we learn, every distinction we draw, every argument we evaluate should deepen our worship and our obedience.

As you begin this course, approach each lesson with the prayer of the psalmist: "Open thou mine eyes, that I may behold wondrous things out of thy law" (Psalm 119:18).