From Claude.ai
Here is a thorough overview of how critical Bible scholars define these two major Trinitarian heresies, along with the key teaching analogies scholars use to illustrate them.
Arianism
Definition
Arianism is a Christological doctrine that rejects the traditional notion of the Trinity, teaching that Jesus was created by God and is therefore distinct from God. It is named after its proponent Arius (250 or 256–336 AD) and is regarded as heretical by most modern mainstream branches of Christianity. Wikipedia
The basic tenet of Arianism was a negation of the divinity of Christ and, subsequently, of the Holy Spirit. Arius reduced the Christian Trinity to a descending triad, of whom the Father alone is true God. The key to the theology of Arius is the doctrine of agennèsia (the unbegotten) as the essential attribute of the Godhead — God is by necessity not only uncreated, but unbegotten and unoriginate. Hence God is absolutely incommunicable and unique. As a result the Logos, whom the Scriptures designate clearly as begotten from the Father, cannot be true God. Encyclopedia.com
Arian theology holds that Jesus Christ is the Son of God, who was begotten by God the Father, with the difference that the Son of God did not always exist but was begotten/made before time by God the Father. Therefore, Jesus was not coeternal with God the Father, but nonetheless Jesus began to exist outside time. The Son is distinct from the Father and therefore subordinate to him. epfl
Council Response
The Council of Nicaea (325 AD) decisively condemned Arianism and affirmed the full divinity of the Son. The council produced the Nicene Creed, which declared that the Son is “begotten, not made, of one substance (homoousios) with the Father,” affirming that the Son is fully divine and co-eternal with the Father. Monergism
Scholarly Critique
Arianism is based on a faulty and partial reading of the Biblical texts through rationalistic presuppositions. Arius’ insistence that the doctrine of monotheism requires God to be unipersonal necessarily precludes the doctrine of the Trinity. Yet, having asserted the absolute importance of monotheism, by insisting on applying the name of “god” to the Son, Arianism in fact becomes at best a form of henotheism — the idea that there are multiple gods, but that one is superior in nature to the other. Banner of Truth
Modalism (Sabellianism)
Definition
Modalism, also called Sabellianism, is the unorthodox belief that God is one person who has revealed himself in three forms or modes, in contrast to the Trinitarian doctrine where God is one being eternally existing in three persons. According to Modalism, during the incarnation, Jesus was simply God acting in one mode or role, and the Holy Spirit at Pentecost was God acting in a different mode. Thus, God does not exist as the Father, Son, and Holy Spirit at the same time. Modalism thus denies the basic distinctiveness and coexistence of the three persons of the Trinity. Theopedia
The belief is that during Old Testament times, God manifested himself in the mode of the Father. Then, at his incarnation as Jesus, he revealed himself as the Son, and then, after Jesus’ ascension, he revealed himself in the mode of the Holy Spirit at Pentecost. The modes appeared successively and never simultaneously. OrthodoxWiki
Origin and Condemnation
Sabellianism appeared for the first time in the second century in the form of Monarchianism. Adolf von Harnack coined the term “Modalism” for this 2nd-century doctrine, which referred to the Trinity as consisting of “three modes or aspects of one divine existence.” Wikipedia
Sabellius viewed God’s complete unity as most important, causing him to exclude the nature of the Trinity. As a result, he taught that God was a monad (single unit) instead of a triad (three units). Sabellius was condemned and excommunicated by Pope Calixtus in 220 AD. Christianity.com
Modern Expressions
The most significant modern revival of Modalism occurred in the early 20th century with the emergence of Oneness Pentecostal denominations. jdavison
Teaching Analogies and Their Problems
Scholars are nearly unanimous that popular analogies for the Trinity inadvertently illustrate one of these two heresies. As theologian Carl Trueman (Westminster Seminary) has noted, there are few, if any, adequate analogies for the Trinity, because nearly every one of them inevitably leads to heresy. Place for Truth
The Water / Ice / Steam Analogy → Modalism
Describing the Trinity as liquid, ice, and steam is a heresy called Modalism, which teaches that the Father, Son and Holy Spirit are three modes of existence for the one God. Water cannot be liquid, ice, and steam at the same time, all the time. God is Father, Son, and Holy Spirit at the same time, all the time. Thirdmill
This analogy illustrates the heresy of Modalism, which argued that there was one God who revealed himself in different modes, but God could only take one form at a time. The baptism of Jesus (Matt. 3) clearly describes all three distinct members of the Trinity — Father, Son, and Spirit — existing at the same time in the same place. United City Church
The Sun / Light / Heat Analogy → Arianism
The sun analogy — where the Father is the sun itself, while the Son and Holy Spirit are the light and heat created by the Father — can be seen to express Arianism, the heretical view that the Father is superior to the Son and Holy Spirit by being a different and “higher” divine substance than the latter two. In the sun analogy, the light and heat are passive byproducts of the sun and are not true equals in the way that the Father, Son, and Holy Spirit share equally and completely in the divine nature. Catholic Answers
Light and heat are creations of the sun, yet it is the heresy of Arianism which claims that the Son and Spirit are mere creations of the Father. Thirdmill
The Shamrock / Three-Leaf Clover Analogy → Arianism / Tritheism
St. Patrick of Ireland (5th century) states that the Trinity is like a three-leaf clover with three separate leaves connected by one stem. However, it fails to show three truly distinct parts capable of functioning independently of one another. In essence, it illustrates that each member of the Trinity is partially God, but not fully God, and they cannot act independently of one another. This analogy illustrates the heresies of Arianism and polytheism. United City Church
The “One Man, Three Roles” Analogy (Father / Son / Uncle) → Modalism
Though a man may be a son, father, and uncle, he is not three persons, as God is, but one person who has three titles. Scholars point out this is the most intuitive but also the most theologically dangerous analogy in everyday preaching. Catholic Answers
The Egg Analogy → Partial Divinity Error
The egg analogy — one egg comprised of a yolk, shell, and albumen — fails because each part of the egg is only one portion of the whole. Therefore, each part of the egg isn’t the essence of the whole. This contradicts the orthodox position that each person of the Trinity is fully God, not merely a portion of God. Thirdmill
Summary Table
| Heresy | Core Error | Analogy That Illustrates It |
|---|---|---|
| Arianism | Son/Spirit are created, lesser beings | Sun, light & heat; Shamrock |
| Modalism | One God in sequential roles/masks | Water/ice/steam; One man with three titles |
As scholars from Thirdmill, Catholic Answers, and Westminster Seminary all converge in noting, our attempts to explain the mystery of God’s three-and-oneness always fall short. Each heresy sought to emphasize an aspect of what Scripture teaches about the nature of God — the problem is that they do so at the expense of the other aspects the Bible emphasizes, and the same thing happens whenever we try to use analogies to describe the Trinity. Aaron Armstrong
