“Many Christians expect the world to respect the book they neglect.”— E. C. McKenzie

Theology matters. It’s the study of God. It’s been said before that, “What you believe about God is the most important thing about you.” Every Christian in the world is a theologian. That sounds overboard, I know—but think about it for a moment: every believer has an idea of what God is like. Every believer has an idea of the nature of God and what He requires of us. And that is the essence of theology: it is the study of God.

It seems today, however, that if you mention the words theology or doctrine that you get quite a few negative reactions. Few, it seems, want to be seen as “theologians.” Aren’t theologians, after all, just impractical people given over to fussing over Bible trivia, and engaging in doctrinal hair-splitting? If you have harbored such thoughts like that, then what I am saying may be a surprise to you. But as children of God, it only makes sense that we should strive to know all we can about our heavenly Father, His ways and His will for our lives. Taking a casual approach to our beliefs nearly guarantees frustration and misunderstanding in our relationship with God. That’s why theology is important. “If you do not listen to theology, that will not mean that you have no ideas about God. It will mean that you have a lot of wrong ones—bad, muddled, out-of-date ideas.”—C. S. Lewis (1)

With that being said, why is studying theology absolutely necessary? (2)

1. The Basic Reason

Theology cannot “improve” on the Bible by doing a better job of organizing its teachings or explaining them more clearly than the Bible itself has done. We get our theology from the sufficient Word of God. Still, Jesus commanded His disciples and now commands us also to teach believers to observe all that He commanded. He said, “Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age” (Matt. 28:19-20).

In order to teach all that Jesus commanded, is simply to teach the content of the teaching of Jesus as recorded in the gospels (Matthew-John). But in a broader sense, “all that Jesus commanded” includes the interpretation and application of His life and teachings, because in the book of Acts it is implied that it contains a narrative of what Jesus continued to do and teach through the apostles after His resurrection: “I [Luke] have dealt with all that Jesus began to do and teach” (Acts 1:1). “All that Jesus commanded” also includes the Epistles of the New Testament, since they were written under the inspiration and supervision of the Holy Spirit and were also considered to be a “command of the Lord” (1 Cor. 14:37; John 14:26; 16:13; 1 Thess. 4:15; 2 Peter 3:2; Rev. 1:1-3). So in a larger sense, “all that Jesus commanded” includes all of the New Testament.

Additionally, when we consider that the New Testament writings entirely endorse the absolute confidence Jesus had in the authority and reliability of the Old Testament Scriptures as God’s words, and when we realize that the New Testament epistles also endorse this view of the Old Testament, then it becomes evident that we cannot teach “all that Jesus commanded” without including all of the Old Testament (rightly understood, that is) as well.

The task of fulfilling the Great Commission includes not only evangelism, but also teaching. And the task of teaching all that Jesus commanded us is, in a broad sense, the task of teaching what the whole Bible says to us today. Therefore, for us to learn what the Bible says, it is necessary to employ theology (the study of God). The basic reason for studying theology, then, is that it enables us to teach ourselves and others what the whole Bible says and teaches, thus fulfilling the second part of the Great Commission (which cannot be divorced from the first part).

2. The Benefits to Our Lives

Of course, the basic reason for studying theology is that it is a means of obedience to our Lord’s command. But there are some additional specific benefits that come from such study:

1. First, studying theology helps us overcome our wrong ideas. If there were no sin in our hearts, we could read the Bible from cover to cover and, although we would not immediately learn everything in the Bible, we would most likely learn only true things about God and His creation. But with sin in our hearts we retain some rebelliousness against God. At various points there are, for all of us, biblical teachings which for one reason or another we do not want to accept. The study of theology helps us overcome those rebellious ideas. It is helpful for us to be confronted with the total weight of the teaching of Scripture on a particular subject, so that we will more readily be persuaded even against our initial wrongful inclinations. So studying theology helps us overcome our wrong ideas.

2. Second, studying theology helps us to be able to make better decisions later on new questions of doctrine that may arise. We will not know what new doctrinal controversies will arise in the churches in which we will live and minister ten or twenty years from now. But they will arise, and when they do, Christians will be asking, “What does the whole Bible say about this?” Whatever the new doctrinal controversies are in future years, those who have learned theology well will be much better able to answer the new questions that arise. For example, if you read the older books on systematic theology, there is no addressing of the sinfulness of same-sex marriage. There would be a defining of what the Bible teaches about right marriage, but for the days of older theologians writing these books, same-sex marriage was just not an issue. Today however, you cannot avoid the obvious problem of same-sex marriage. There are denominations even today who have shaky, wrong theologies, and thus approve of same-sex marriage. Who knows what doctrinal controversies will arise in the coming decades/years? Because the Bible is related to every area of life, those who have studied theology well will know what the whole Bible teaches on these controversies.

3. Thirdly, studying theology will help us grow as Christians. The more we know about God, about His Word, about His relationships to the world and mankind, the better we will trust Him, the more fully we will praise Him, and the more readily we will obey Him. Studying theology rightly will make us more mature Christians. If it doesn’t, then we aren’t studying theology rightly. In fact, the Bible often connects sound doctrine with maturity in Christian living: Paul speaks of “the sound words of our Lord Jesus Christ and the teaching that accords with godliness” (1 Tim. 6:3), and says that his work as an apostle was “for the sake of the faith of God’s elect and their knowledge of the truth, which accords with godliness” (Titus 1:1).

Conclusion

The greatest commandment, Jesus said, is to “love the Lord your God with all your heart and with all your soul and with all your mind” (Matthew 22:37). He did not give options, as if we could love God with heart or soul or mind; the command requires all of the above. Loving Him with our minds will naturally entail finding out as much as possible about Him. Just as in any relationship, love compels us to know and understand what He is like, how He works in the world and in us, what He loves, what He desires, what offends Him, and what delights Him. Doing so requires our full attention and our diligent study of theology.

1. Cited in David Horton, The Portable Seminary (Bloomington, MN: Bethany House Publishers, 2006), 18.

2. This is adapted from Wayne Grudem, Systematic Theology (Grand Rapids, MI: Zondervan, 1994), 27-30.