Obedience and the Call to Teach All Christ Commanded

Christian theology does not begin with human curiosity or philosophical speculation. It begins with obedience.

When the risen Christ gave the Great Commission, He did not merely command His disciples to go and make converts. He commanded them to make disciples—and to do so by teaching. Jesus’ words are clear:

“Go therefore and make disciples of all nations… teaching them to observe all that I have commanded you.” (Matthew 28:19–20)

That final phrase matters more than we often realize. Christ did not say, “Teach them some helpful principles,” or “Teach them what feels most relevant.” He said, all that I have commanded you. The task of the church, then, is not only evangelism, but instruction—faithful, comprehensive teaching rooted in the words of Christ Himself.

This is where theology enters the picture.

Systematic theology exists because the church is commanded to teach the whole counsel of Christ. To teach all that Jesus commanded requires more than isolated Bible verses or spiritual slogans. It requires careful attention to Scripture as a unified whole. It requires listening, organizing, and faithfully passing on what God has revealed.

John Calvin captured this well when he wrote that Christian instruction must be shaped by “the sum of doctrine which it is our duty to receive” (Institutes of the Christian Religion, 2.10.1). Theology, rightly understood, is not an academic luxury—it is an act of obedience to Christ.

At its best, systematic theology seeks to gather everything Scripture teaches about God and His work and to present it clearly and faithfully. It helps the church confess what it believes about God, Christ, salvation, the Spirit, and the Christian life—not by inventing new truths, but by bringing biblical teaching together into a coherent witness.

This work matters because believers do not live in a vacuum. We are constantly shaped by cultural pressures, competing worldviews, and internal confusion. Theology equips the church to respond thoughtfully and faithfully, grounding believers in truth so that faith does not collapse under pressure. When doctrine is clear, obedience becomes possible. When doctrine is neglected, confusion follows.

Still, theology must always remain a servant—never a master.

To engage in theology is not to improve upon God’s Word, as if Scripture were incomplete or unclear. Herman Bavinck made this point with characteristic precision: “Dogmatics does not enrich Scripture, but only reproduces it; it does not add to it but only arranges it” (Reformed Dogmatics, 1:82). Theology does not stand above Scripture. It kneels beneath it.

The danger arises when theology is treated as something that judges Scripture rather than listens to it—when cultural trends or philosophical fashions begin to reshape what the Bible is allowed to say. At that point, theology ceases to serve the church and begins to distort it.

Karl Barth warned against this temptation when he described dogmatics as “the self-examination of the Church with respect to the content of its distinctive talk about God” (Church Dogmatics, I/1). Theology is meant to test the church’s speech, not replace God’s voice. It exists to help the church ask whether it is truly speaking in accordance with Scripture.

For this reason, theology must always remain subordinate to the Word of God. Scripture alone is the final authority. Theology is accountable to it, corrected by it, and sustained by it.

This submission to Scripture rests on two foundational convictions long held within Protestant Christianity: the sufficiency and clarity of Scripture.

The sufficiency of Scripture means that God has given His people everything they need for salvation and godly living in His Word. Christians do not need additional revelation to know God’s will. As Louis Berkhof explained, “The doctrine of the sufficiency of Scripture implies that Scripture contains all the words of God which He intended His people to have at each stage of redemptive history” (Systematic Theology, 63). God has not left His church lacking.

Closely related is the clarity—or perspicuity—of Scripture. This does not mean that every passage is equally easy to understand, but it does mean that the central truths of the faith are clear and accessible to ordinary believers. Wayne Grudem summarizes this well: “The Bible is written in such a way that all things necessary to become a Christian, live as a Christian, and grow as a Christian are clear” (Systematic Theology, 108).

Together, these doctrines protect the church from two errors: the belief that Scripture is insufficient and must be supplemented, and the belief that Scripture is too obscure for everyday Christians to understand. God speaks clearly, and He speaks fully.

Because of this, theology must be pursued with reverence and humility. Its purpose is not to tame Scripture or bend it to our preferences, but to help God’s people hear it more clearly. Theology orders our understanding so that the whole counsel of God may be known, taught, and obeyed.

When practiced rightly, systematic theology does not obscure God’s Word—it magnifies it. It guards the church against error, strengthens believers for faithful living, and directs worship toward the true God. Far from being a dry academic exercise, theology is a vital part of the church’s life and witness.

To teach all that Christ commanded requires careful listening, faithful organization, and humble obedience. Theology exists for this reason—and the church cannot afford to neglect it.

Theology is not speculation—it is obedience learned at the feet of Christ.

— Zach Strange

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