What Makes a Good Commentary?

Question 1052.

A good commentary is not always easy to spot on a crowded shelf, and that is the honest problem behind this question. Walk into any Christian bookshop, or browse online, and you will find hundreds of commentaries on every book of the Bible, from slim paperbacks to multi-volume sets that could double as doorstops, priced anywhere from a few pounds to several hundred. How do you know which ones are actually worth your time and money, and what separates a genuinely helpful commentary from one that will gather dust on your shelf?

What a Commentary Is Actually For

Before discussing what makes a commentary good, we need to be clear about its purpose. A commentary exists to help you understand the biblical text better than you could manage entirely on your own. That is its whole job. It is a tool, not a replacement for Scripture itself, and the moment you find yourself reading the commentary more than the Bible it is explaining, something has gone quietly wrong.

A good commentary serves the text rather than using it. It illuminates what is genuinely there, explains what is difficult, and helps you notice things you might otherwise have missed. It does not impose ideas onto Scripture or treat the Bible as a launching pad for the author’s own theological hobby-horses. The best commentators write with a kind of humility, aware that they are servants of the Word rather than masters of it, offering their scholarship in submission to the text rather than in competition with it. Think of a good commentator as a knowledgeable travelling companion rather than a tour guide who talks over the sights you came to see.

Marks of a Good Commentary

A good commentary pays careful attention to the original languages (dokimos, tested and approved) without assuming the reader already knows Greek or Hebrew, translating technical observations into plain, usable explanation. It takes historical and cultural context seriously, because a great deal of Scripture only makes full sense once you understand the world it was written into. It also engages honestly with difficult passages rather than skating past them, telling you when a verse is genuinely disputed among careful scholars rather than pretending the matter is settled when it is not.

A good commentary is also theologically coherent with the rest of Scripture. If a commentator’s interpretation of one passage would require reworking settled doctrine drawn from dozens of other passages, that is a signal to weigh the interpretation carefully rather than accept it uncritically simply because it appears in print with academic credentials attached. It also tends to be honest about its own limitations, noting where scholarly opinion genuinely divides rather than presenting one contested view as the unanimous consensus of the field.

The Danger of Commentary-Shopping for a Predetermined Answer

It is tempting, particularly when preparing a sermon or working through a genuinely difficult passage, to keep opening commentaries until you find one that says what you already wanted it to say. This is a subtle danger worth naming honestly. A good commentary is chosen for its scholarship and its faithfulness to the text, not auditioned for its agreement with your existing conclusions. If every commentary you consult disagrees with your initial reading, the wiser response is usually to reconsider the reading, not to keep shopping until you find an outlier who confirms it.

Devotional Commentaries Versus Technical Commentaries

Commentaries generally fall along a spectrum from devotional, aimed at general readers and light on Greek or Hebrew detail, through to technical, aimed at those working directly with the original languages and interacting closely with academic scholarship. Neither end of the spectrum is inherently superior to the other; they simply serve different purposes. A devotional commentary is often exactly right for daily reading and application. A technical commentary earns its keep when you are wrestling with a genuinely difficult verse and need to see the grammatical or textual options laid out clearly. Owning at least one good commentary from each end of that spectrum, for the books of the Bible you study most, serves most readers well.

Practical Guidance for Choosing One

When choosing a commentary, it helps to know something about the author’s theological framework in advance, since every commentator writes from some perspective, whether stated or not, and knowing that perspective helps you read with appropriate discernment rather than false neutrality. It also helps to read reviews from trusted sources before buying an expensive multi-volume set, since not every well-reviewed commentary suits every reader’s purpose. And it is worth remembering that even the very best commentary remains a human tool: useful, sometimes brilliant, but never infallible in the way Scripture itself is.

A practical test worth trying before you buy: open the commentary to a passage you already know reasonably well, ideally one with some genuine interpretive difficulty attached, and read what the author does with it. Does the explanation illuminate the text, engage honestly with the difficulty, and point you back to Scripture with fresh clarity? Or does it feel evasive, thin, or more interested in the author’s own pet themes than in the passage itself? This small test, applied consistently, will save you from a great many disappointing purchases.

Building a Commentary Library Over Time

Nobody needs to build a complete commentary library in a single afternoon, and trying to do so usually produces an expensive shelf of half-read volumes. A wiser approach buys commentaries as genuine need arises, when you are preparing to teach through a particular book, or when a specific passage has you genuinely stuck, rather than purchasing speculatively for books you may study only occasionally. Over years of ministry this need-driven approach tends to produce a more genuinely useful library than any attempt to acquire everything at once, and it keeps the emphasis where it belongs: on actually reading and using what you own rather than simply possessing it.

A Biblical Model for the Commentator’s Task

Scripture itself models the basic task any good commentary attempts. When Ezra and the Levites read the Law aloud to the returned exiles, they did not simply recite the words; they “gave the sense, so that the people understood the reading” (Nehemiah 8:8). That phrase, giving the sense, is a fair one-line description of what any faithful commentator is trying to do across the centuries since. Paul’s charge to Timothy points the same direction: rightly handling the word of truth (2 Timothy 2:15) is precisely the discipline a good commentary is meant to model and to help its reader practise, rather than a task the reader can simply outsource permanently to someone else.

This biblical pattern is worth keeping in view because it reframes what a commentary is actually for. It is not a substitute for the hard, patient work of reading Scripture carefully yourself; it is training in how to do that work better, offered by someone further along the road who has already wrestled with the passage in front of you. Read that way, even a modest commentary becomes a genuine teacher, and the habit of consulting one becomes an act of humility rather than intellectual outsourcing.

When a Commentary Disagrees With Your Tradition

Occasionally a genuinely good commentary will reach a conclusion that sits uneasily with the tradition you were raised in or the position you have long assumed was simply obvious. This is not automatically a sign that the commentary is unreliable, nor is it automatically a sign that your tradition is wrong. It is an invitation to slow down and examine the actual exegetical argument being made, checking it against the text itself rather than against how comfortable or uncomfortable the conclusion feels. Some of the most valuable moments in my own study have come from exactly this kind of friction, where a careful commentator forced me to reconsider a passage I had assumed I already understood. Handled well, this friction sharpens conviction rather than eroding it, because a position tested against genuine scholarly challenge and found still standing is held more securely than one simply inherited without examination.

So, now what?

If you are building a library, do not feel you need every commentary ever written on a given book. A small number of genuinely good ones, chosen with care and read alongside your own honest engagement with the biblical text, will serve you far better than a shelf groaning under the weight of volumes you never actually open. The goal was never to collect commentaries. It was always to understand God’s Word more clearly, so that you could live it out more faithfully, and a shelf of unread books never once accomplished that on its own.

For related guidance on building out the rest of your toolkit, see my articles on study Bibles and on essential Bible study tools more broadly, both of which pick up threads this article has only had space to introduce, and both worth reading alongside whatever commentary you choose to add to your own shelf next.

Do your best to present yourself to God as one approved, a worker who has no need to be ashamed, rightly handling the word of truth.

2 Timothy 2:15