Gospel Guidebook: Getting and Keeping It Right 
Problems with the Heidelberg Catechism's Description of Faith
by Robert P. TerryUpdated July 5, 2026
The Heidelberg Catechism is an important exposition of doctrine for Reformed believers. The catechism consists of 129 questions and answers that can be divided in four basic units: man's misery, man's redemption, thankfulness, and prayer. The catechism was mainly composed by Zacharius Ursinus (1534–1583) and was published in 1563. The original document was written in German, but there are at least two English versions. In this article, I will be criticizing the catechism's description of faith based on the English version found here, but everything I say in regard to that version equally applies to the English version found in Philip Schaff's "Creeds of Christendom Volume III" available here.
In this article, I will be focusing on the Heidelberg Catechism's description of faith given in Lord's Day 7, but the problems created by wrongly understanding the nature of faith are pervasive throughout the whole catechism. For example, the Heidelberg Catechism says in Lord's Day 32 that we "may be assured of our faith by its fruits." This false idea that we can be assured of faith by looking at our works has caused endless amounts of grief for people with tender consciences, keeping them trapped in a system of works salvation. Why would you look to be assured of your faith when, instead, you can just believe the Gospel? Doesn't this looking for assurance of faith betray a lack of faith? The moment you look for assurance of faith is the same moment you remove your eyes from the object of faith. People who believe don't need assurance that they are believing. They just believe. Furthermore, the very idea that faith produces fruit exposes a serious misconception about the nature of faith, namely that it consists of a works-producing principle by which it essentially becomes a law of works in itself. What we are dealing with here in the Heidelberg Catechism is nothing less than deep-seated works salvation. It's no wonder that so many Reformed people are tormented with doubts over the genuineness of their faith.
Moving on, the Heidelberg Catechism says in Lord's Day 7:
Q20 Are all men, then, saved by Christ just as they perished through Adam?
A20 No. Only those are saved who by a true faith are grafted into Christ and accept all his benefits.
Q21 What is true faith?
A21 True faith is a sure knowledge whereby I accept as true all that God has revealed to us in his Word. At the same time it is a firm confidence that not only to others, but also to me, God has granted forgiveness of sins, everlasting righteousness, and salvation, out of mere grace, only for the sake of Christ's merits. This faith the Holy Spirit works in my heart by the gospel.
Starting with Q&A #20, we should be wary any time the word faith is modified by adjectives like "true," "hearty," "upright," etc. Those modifiers indicate that a sleight of hand is at play, in which the word faith will be hijacked and transformed into a scheme of works salvation, at the very least requiring it to be an appropriating instrument. The "true faith" of the Heidelberg Catechism is no exception to this and I will discuss the problems of this "true faith" in subsequent paragraphs. However, perhaps equally troubling is the idea that salvation requires people to accept the benefits of Christ. The benefits of Christ are not things that sinners accept, as if God were trying to strike a deal with them. Unhappily, the Heidelberg Catechism seems very much in the business of peddling the Gospel, going so far as to say that all we need to do is "accept this gift with a believing heart" in Q&A #60 and that "we can accept the righteousness of Christ and make it our own by faith only" in Q&A #61. The Gospel is not an offer than needs to be accepted. Rather, it is a proclamation concerning God's Son and His accomplishments. The benefits of Christ, including faith in the Gospel, are things that God bestows on people according to His own pleasure for the sake of what Christ did for them.
Moving on to Q&A #21, I'd like to skip the first sentence for the time being and focus on the second sentence where it says that faith consists in a "firm confidence that not only to others, but also to me..." This sentence is problematic because unless Universalism is true, something that seems unlikely, there is no way anyone can know if Christ died for him individually in an efficacious manner. Therefore, the proposition "Christ died for me" cannot be part of the Gospel or made to be a qualification for believing the Gospel. The Heidelberg Catechism is essentially requiring sinners to appropriate to themselves the status of the elect by performing some elusive and mystical "true faith" until they can, somehow, perhaps through a private word they suppose to be from the Holy Spirit working in their heart, confidently say, "Christ died for me." The Heidelberg Catechism thus nullifies the Gospel of Christ by moving the focus away from what Christ did for sinners and putting the focus on what the Holy Spirit is supposedly doing in sinners.
Now, looking at Q&A #21 as a whole, what I see is this: (1) "sure knowledge," (2) "accept as true all," and (3) "firm confidence." Ignoring the problems created by the adjectives "sure" and "firm," the Heidelberg Catechism describes faith in terms of the three components commonly referred to by theologians as notitia (the content of something to be believed), assensus (the conviction or persuasion that the content is true), and fiducia (which as a bare minimum includes an appropriating personal trust and reliance, but can include other things such as "surrender of the soul," as described by Reformed theologian Louis Berkhof on page 505 of his Systematic Theology). In contrast to this "true faith," the word faith as used in the Bible and in every other realm of life outside religion simply means to be persuaded by the evidence for a thing, requiring only notitia and assensus. Please understand this: if we believe that "Christ did it all" (John 19:30, etc.), then faith can be no more than notitia and assensus. To what extent fiducia exceeds notitia and assensus is the extent to which Christ did not do it all. The introduction of fiducia nullifies the cross of Christ.
Let's consider an excerpt from the Routledge Encyclopedia of Philosophy on the topic of Belief:
We believe that there is coffee over there; we believe the special theory of relativity; we believe the surgeon; some of us believe in God. But plausibly what is fundamental is believing that something is the case – believing a proposition, as it is usually put. To believe a theory is to believe the propositions that make up the theory, to believe a person is to believe some proposition advanced by them; and to believe in God is to believe the proposition that God exists. Thus belief is said to be a propositional attitude or intentional state: to believe is to take the attitude of belief to some proposition. It is about what its propositional object is about (God, the operation, or whatever). We can think of the propositional object of a belief as the way the belief represents things as being – its content, as it is often called.
This explanation and the conclusion in the last two sentences describe the nature of faith (Gr. pistis = belief). This description applies to every realm of life, including religion, from the standpoint of the encyclopedia's contributors. However, it is only in the realm of religion that theologians, such as Ursinus and Berkhof, smuggle this fiducia and other baggage (such as teaching that we "may be assured of our faith by its fruits") into the meaning of faith, thereby hijacking faith, holding it hostage, and transforming it into something that bears the name faith but is actually something different. Thankfully, contrary to the Heidelberg Catechism, we have the biblical testimony that what faith means in every other realm of life is exactly what it means when applied to the Gospel (see, for example, Jesus' description of "believing" in John 3:11-12, John the Baptist's in John 3:32-36, the Apostle John's in 1 John 5:9-10, and the author of the Hebrews' description of faith in Hebrews 11:1).
The Heidelberg Catechism's description of faith is unbiblical and dangerous. Even worse, because the Heidelberg Catechism misunderstands the nature of faith, it also misunderstands the Gospel. It is because of documents like the Heidelberg Catechism that millions of Reformed believers live their lives either deluded, thinking that they appropriated justification to themselves through fiducia, or they live with great anxiety because they doubt the quality of their fiducia. Little do they know that they are practicing works salvation under the guise of "true faith." In contrast to the mystical "heart work" of fiducia, whereby the sinner must appropriate to himself things that aren't true until they are appropriated, when God wants to open the eyes of a sinner to see the things that are true even before they are believed, He shines upon him the content of the Gospel to give him knowledge of the glory of God in the face of Jesus Christ.