We are a spirit, we have a soul, we live in a body

In 1 Thessalonians 5:23, 'spirit' (πνεῦμα) often refers to the highest part of human beings, that which connects with God. However, in the New Testament, 'pneuma' and 'psychē' (soul) are often used interchangeably or to refer to the same immaterial part of human beings, which makes a rigid ontological distinction difficult.

The 'psyche' (soul) is the seat of life, personality, emotions, and will. In dichotomous theology, soul and spirit are aspects of the same immaterial entity. In trichotomy, they are seen as distinct parts, with the soul mediating between spirit and body.

The 'soma' (body) refers to the physical and material part of human beings. The mention of the three terms in 1 Thessalonians 5:23, preceded by 'your whole being' (ὁλόκληρον), suggests an enumeration to emphasize the totality of the person, not necessarily a precise ontological division.

This adjective is crucial. It precedes the list 'spirit, soul, and body' and emphasizes that Paul's prayer is for the sanctification of the person in their totality, leaving no part out. This supports the idea that the list is a way of emphasizing integrity, not a dissection of human nature.

Patristic

The Church Fathers approached the constitution of the human being from diverse perspectives, without reaching unanimous consensus. Irenaeus of Lyons (c. 130-202), in 'Against Heresies' (Book V, Chapter 6; PG 7, col. 1137-1140), develops an explicitly trichotomous anthropology: he distinguishes the body (σάρξ/caro), the soul (ψυχή/anima), and the spirit (πνεῦμα/spiritus), arguing that the perfect human being is the combination of all three and that the Holy Spirit dwells in the human spirit. However, Irenaeus does not defend trichotomism as the ontological independence of three separate substances, but rather as the condition for the integral salvation of the human person. Tertullian (c. 155-240), by contrast, clearly leans toward a dichotomous view: in 'De Anima' (Chapters 10-16; PL 2, col. 661-680), he maintains that the spirit is a faculty or function of the soul, not a distinct entity, identifying soul and spirit as a single immaterial reality. Origen (c. 185-254), in 'On First Principles' (De Principiis, Book II, Chapter 8; PG 11, col. 235-242) and in his homilies, shows greater affinity with a trichotomous reading derived from 1 Thess 5:23, distinguishing πνεῦμα, ψυχή, and σῶμα as differentiated dimensions of the human being, though his speculative system resists rigid classification. In general, the Fathers employed the terms 'soul' and 'spirit' with notable semantic flexibility, adapting them to exegetical or polemical contexts, making it difficult to ascribe absolute systematic positions to them.

Reformed

Reformed theology, following figures like John Calvin, generally holds a dichotomous anthropology. Human beings are understood to be composed of two main parts: the body (material) and the soul/spirit (immaterial). The terms 'soul' and 'spirit' are often considered synonyms or different aspects of the same immaterial essence, without a strict ontological distinction. The prayer in 1 Thessalonians 5:23 is interpreted as a reference to the totality of the person, not as a division into three distinct parts.

Interpretive tension: Tension within this system arises when explaining passages like Hebrews 4:12 ('the word of God... pierces even to the dividing of soul and spirit'), which seem to suggest a more marked distinction. Dichotomists usually interpret this as a reference to the depth of the Word's penetration, discerning even the most subtle distinctions within the immaterial part, rather than a real ontological division.

Arminian

Within the Arminian and Wesleyan tradition, anthropology also tends to be dichotomous, similar to the Reformed view. However, in some broader evangelical movements with Arminian or Pentecostal roots, the trichotomous view has gained popularity. This reading emphasizes the distinction between spirit (the part that is regenerated and connects with God), soul (mind, emotions, will), and body, often to explain different aspects of the Christian experience, such as the renewing of the mind or inner healing. Tension arises when trying to harmonize this distinction with the unity of human beings and holistic sanctification.

Interpretive tension: Interpretive tension arises in how to maintain the unity and integrity of human beings, which Scripture emphasizes (as in the resurrection of the body), while postulating an ontological division into three parts. If the spirit is the 'regenerated' part, how does it relate to the sanctification of the soul and body without creating a hierarchy or fragmentation that the text does not explicitly state?

Contemporary

In contemporary theology, the debate between dichotomy and trichotomy persists. Authors like Wayne Grudem (dichotomist) argue that the Bible uses 'soul' and 'spirit' interchangeably or to refer to the same immaterial part, and that 1 Thessalonians 5:23 is an enumeration to emphasize totality. Others, like Watchman Nee, have popularized trichotomy, arguing that it is essential for a deep understanding of spiritual life and relationship with God. N.T. Wright, for his part, emphasizes the unity of human beings and the importance of the body in eschatology, downplaying rigid ontological divisions.