What is the difference between primary, secondary, and tertiary doctrines?

Question 7.

Learning to tell primary truths from secondary doctrines is one of the most useful skills a Christian can develop, and the lack of it has wrecked more friendships and split more churches than I care to count. Some believers treat every conviction they hold as a hill to die on. Others treat nothing as worth defending at all. Both are mistakes, and both come from never learning to weigh doctrines according to their place.

The historic shorthand for this is the threefold division of primary, secondary, and tertiary doctrines, and I want to take time over it because it deserves more than a slogan. There is an old saying often credited to the Reformation era, in essentials unity, in non-essentials liberty, in all things charity. It is a fine motto, but it is useless until you can actually tell which things are essential. So let me lay out how I sort them, and why the difference matters so much in practice.

Why the Bible Itself Ranks Truths

Some people object straight away that all Scripture is God-breathed, so how dare anyone call one teaching more important than another. I take the authority of every word of Scripture with full seriousness, and I have written separately about what it means that Scripture is breathed out by God. But ranking the weight of doctrines is not the same as ranking the truthfulness of texts. Every word of God is equally true. Not every truth carries equal consequence.

Jesus Himself made this kind of distinction. He rebuked the Pharisees for tithing their garden herbs while neglecting the weightier matters of the law, justice and mercy and faithfulness. He did not tell them to stop tithing. He told them they had lost all sense of proportion. There are weightier matters and lighter ones, and a mature believer can tell them apart.

Paul does the same when he hands on the gospel to the Corinthians as of first importance, the death, burial, and resurrection of Jesus according to the Scriptures. The phrase of first importance only makes sense if some things are of second or third importance. So the framework of primary, secondary, and tertiary doctrines is not a clever human invention imposed on the text. It is drawn out of the way the Scriptures themselves speak.

Primary Doctrines: The Ground You Cannot Yield

Primary doctrines are the truths on which salvation itself depends, the non-negotiable core of the faith. Deny these and you have stepped outside Christianity altogether, whatever name you still wear. I would place here the deity and true humanity of Jesus, His bodily resurrection, salvation by grace through faith, the Trinity, and the gospel of His atoning death for sinners.

Paul shows us how seriously these are guarded. In Galatians he pronounces a solemn curse, an anathema, on anyone, even an angel from heaven, who preaches a different gospel. That is the language reserved for primary doctrine. When the saving message itself is at stake, there is no room for compromise and no virtue in pretending the disagreement is small.

John applies the same test to the person of Jesus, warning that anyone who denies the Son does not have the Father either, and calling such a denial the spirit of antichrist. These are the boundary markers of the faith. Cross them and you are no longer inside. That is what makes a doctrine primary, not the heat of our feelings about it but the fact that the gospel stands or falls with it.

What Secondary Doctrines Are and Why They Matter

Secondary doctrines are the truths that genuinely matter, that shape how a church worships and orders its life, but that do not by themselves determine whether a person is saved. This is the tier most people handle worst, because it is the most demanding. Secondary doctrines are important enough to divide congregations and denominations, yet not so fundamental that holding the wrong view places a person outside the family of God.

I would put a good deal here. The proper subjects and mode of baptism, the meaning of the Lord’s Supper, church government, the gifts of the Spirit and whether they continue, the framework of the end times, and the relationship between Israel and the Church. I hold firm convictions on every one of these. I am a Baptist by conviction and a dispensationalist by conviction, and I do not hold those views loosely. Yet I can recognise a brother who differs on these secondary doctrines as a genuine believer bound for the same heaven.

This is why secondary doctrines are the great test of Christian maturity. It is easy to be firm where the gospel itself is at stake, and easy to be relaxed where nothing important hangs on the matter. The difficulty is the middle tier, holding a real conviction strongly enough to build a church on it while still extending true fellowship to those who land elsewhere. Getting secondary doctrines wrong in either direction, by treating them as salvation issues or by pretending they do not matter, causes endless damage.

Tertiary Doctrines: Matters of Christian Liberty

Tertiary doctrines are the third tier, the questions on which sincere believers may simply disagree without it touching either salvation or the basic ordering of the church. I think here of differing views on the days of creation among those who all affirm that God created, opinions about the precise identity of figures in prophecy, convictions about diet, drink, holy days, schooling, and a hundred other matters of conscience.

Paul devotes a whole chapter, Romans 14, to exactly this tier. One person esteems one day above another while another esteems all days alike. One eats meat and another only vegetables. Paul’s ruling is striking. He does not settle the dispute. He tells each to be fully convinced in his own mind and to stop despising or judging the brother who differs. That is the proper handling of a tertiary doctrine, strong personal conviction held with a loose grip on the other person’s conscience.

The error to avoid here is the inflation of tertiary doctrines into tests of fellowship. I have seen believers fracture over questions that Scripture deliberately leaves open, and it grieves me every time. When we make a third-tier matter into a wall, we are wiser than God, who left it as a doorway.

How to Tell Which Tier a Doctrine Belongs To

So how do I actually decide where a given teaching sits? My first question is always whether the gospel itself depends on it. If denying the doctrine means denying the saving work of Jesus or the God who accomplished it, it is primary. The Galatian test applies, and the matter is closed to compromise.

If the gospel survives the disagreement but the ordering of the church does not, I am usually looking at a secondary doctrine. Two people can both be saved while disagreeing about baptism, but they cannot both practise their conviction in the same congregation without one of them yielding. That practical friction is a fair sign that I am in the secondary tier rather than the third.

If neither salvation nor the basic life of the church is touched, and Scripture itself seems content to leave room, then I am in tertiary territory and I reach for Romans 14. The danger throughout is our pride, which loves to promote our pet convictions up the ladder. I have to keep asking whether the Bible ranks this where I am ranking it, or whether I am simply attached to being right.

Let me give a worked example, because the abstraction can feel slippery. Take the question of whether the sign gifts continue today. A cessationist and a continuationist can stand at the same communion table, both trusting the same crucified and risen Jesus, both reading the same Bible with reverence. Their disagreement is real and it touches how a church orders its gatherings, which tells me at once that I am dealing with secondary doctrines rather than the gospel itself. Now contrast that with a man who teaches that Jesus was a created being and not truly God. However charming and sincere he may be, he has denied a primary truth, and no amount of warmth can move that question down into the secondary tier. The test is not how strongly anyone feels but whether the saving gospel survives the disagreement. When I run a contested teaching through that single question, the tier usually becomes plain, and I am spared both the cowardice that treats everything as negotiable and the harshness that treats every difference as heresy. Most of the disputes that tear churches apart are quarrels over secondary doctrines that one side has wrongly promoted to the rank of the gospel.

When the Tiers Get Blurred

Real life rarely sorts itself as neatly as a chart suggests. Some doctrines sit on the border, and godly people place them differently. The authority and trustworthiness of Scripture, for instance, I would push very near the primary tier, because once a man feels free to dispense with the parts of the Bible he dislikes, the gospel itself soon goes with it. Others would call that a secondary doctrine. I understand the debate, and I hold my placement with reasons rather than mere instinct.

What I refuse to do is pretend the tiers do not exist simply because the edges are fuzzy. A coastline is hard to measure precisely, yet no one doubts the difference between land and sea. In the same way, the difficulty of a few borderline cases does not collapse the real and useful distinction between primary, secondary, and tertiary doctrines. The wise course is to hold my placement of such borderline doctrines with conviction yet with humility, ready to explain my reasons and equally ready to keep fellowship with the brother who weighs the same evidence and lands a step to one side of me.

Living with People Who Hold Different Secondary Doctrines

The real test of all this comes not in the study but in the pew, when I worship beside people who hold different secondary doctrines from mine. I am a convinced Baptist, persuaded from Scripture that baptism is for those who have already believed and that it pictures union with Jesus in His death and resurrection. A godly friend who baptises infants reads the same Bible and lands elsewhere. Our disagreement over the subjects of baptism is a genuine difference over secondary doctrines, important enough that we cannot both practise our convictions in one congregation, yet not the kind of difference that unchurches either of us.

I have learned to name secondary doctrines honestly rather than dress them up as gospel essentials or wave them away as nothing. When I treat my secondary doctrines as though salvation hung on them, I become harsh and sectarian, quick to question the faith of anyone who differs. When I pretend my secondary doctrines do not matter at all, I become careless, unwilling to build anything or stand for anything. The mature path holds them as what they are, real convictions worth ordering a church around, gripped with a firm hand where my own practice is concerned and an open hand towards my brother’s conscience.

This is why I think a believer’s handling of secondary doctrines reveals more about their spiritual maturity than almost anything else. Anyone can be firm where the gospel is plainly at stake, and anyone can be relaxed about a trifle. It takes real grace to hold a strong conviction on a secondary doctrine, to teach it, to build a congregation on it, and still to recognise the man who differs as a true brother bound for the same heaven. The same applies to church government, to the continuation of the gifts, and to the framework of prophecy, all of them weighty secondary doctrines on which sincere believers have always differed.

What I refuse to do is let secondary doctrines become a constant battleground that swallows the gospel itself. I have watched congregations pour more heat into a single secondary doctrine than they ever spent on the cross, and the watching world drew its own sad conclusions. The threefold framework exists precisely to keep first things first. Guard the gospel without flinching, hold your secondary doctrines with conviction and charity, and leave the tertiary matters in the liberty where Scripture left them, and you will spare the church a great deal of needless wreckage.

Why This Framework Protects Both Truth and Love

The whole point of sorting doctrines by tier is to let me be uncompromising and gracious at the same time, each in its proper place. Without the framework I am forced into one of two errors, either a brittle spirit that treats every difference as heresy, or a spineless one that treats nothing as worth defending. The tiers let me hold the gospel with an iron grip and hold a brother’s conscience with an open hand.

This is the very thing that makes genuine fellowship across difference possible, which is why this question runs straight into the next one. I have taken up which doctrines are essential for salvation and whether Christians can disagree and keep fellowship in their own articles, and they belong with this one, because knowing how to weigh a doctrine is what allows believers to disagree about real things and still break bread together.

So, now what?

If you have ever found yourself in a fierce argument and could not work out whether it was worth having, this framework is for you. Before your next doctrinal disagreement, stop and ask one question. Is this primary, secondary, or tertiary? The answer will tell you how hard to press and how much to bend.

Train yourself to weigh truths the way the Bible weighs them, defending the gospel without flinching, holding your secondary convictions firmly but charitably, and leaving the tertiary matters where Scripture left them, in the realm of liberty. Do that, and you will save yourself a great deal of needless heartache and serve the unity of the church besides. Where have you been treating a secondary doctrine as though salvation depended on it?

For Further Study

For those who want to dig deeper, the threefold weighing of doctrine is handled well across the dispensational and broader evangelical tradition. Charles Ryrie writes with admirable clarity on essentials and distinctives in his Basic Theology, and Millard Erickson’s Christian Theology gives a careful account of how the church has ranked its convictions through history. J. Dwight Pentecost and John Walvoord model how to hold strong secondary convictions, especially on prophecy and the end times, while still recognising genuine believers who differ. Lewis Sperry Chafer’s Systematic Theology and the writings of Arnold Fruchtenbaum on Israel and the Church show the same instinct at work, firm where the gospel is concerned and measured where it is not.

As for the one who is weak in faith, welcome him, but not to quarrel over opinions. One person believes he may eat anything, while the weak person eats only vegetables. Let not the one who eats despise the one who abstains, and let not the one who abstains pass judgement on the one who eats, for God has welcomed him.

Romans 14:1-3 (ESV)