The development of the doctrine of the Trinity in early Christian theology was indeed influenced by the intellectual environment of the time, which included Greek philosophical thought among other factors. It's important to recognize that the formulation of Christian doctrines, including the Trinity, occurred in a context where various philosophical traditions provided the language and conceptual frameworks that theologians used to articulate their understanding of Christian revelation.
Terminology and Concepts: Early Christian theologians employed terms and concepts from Greek (PAGAN) philosophy to articulate the nature of God and the relationship between the Father, Son, and Holy Spirit. For example, terms like "ousia" (essence or substance) and "hypostasis" (person) were used to describe the unity and distinction within the Godhead. These terms helped theologians to communicate complex theological ideas in a precise and nuanced way.
Platonism and Neoplatonism: These philosophical traditions influenced early Christian thought in significant ways. The emphasis on the transcendence of the highest good and the hierarchical ordering of reality in Platonism and Neoplatonism provided a framework for early Christians to understand the relationship between the divine and the material world. Concepts of emanation and participation in Neoplatonism, for example, helped some theologians think about how the Son could be understood as emanating from the Father without division or separation.
Logos Theology: The concept of the Logos (Word) in John's Gospel was interpreted by early Christians in light of the Stoic and Platonic notion of the Logos as a rational principle organizing the cosmos. This helped Christians articulate how the Son (the Logos) relates to the Father and the world. Theologians like Justin Martyr and Philo of Alexandria, a Hellenistic Jewish philosopher, made significant contributions to Logos theology by integrating these philosophical notions with biblical texts.
Jesus spoke Aramaic, the common language of Judea in his time. The New Testament was written primarily in Greek, but the focus was on conveying Jewish religious ideas, not Greek philosophy. The New Testament authors aimed to fulfill and reinterpret the Hebrew Bible for a Jewish audience, not introduce foreign philosophical ideas. Jesus and the original writers of the New Testament did not explicitly use Greek philosophy in their teachings in the way we might think of a philosopher engaging directly with philosophical concepts or systems. Their primary context was the religious and cultural milieu of 1st-century Judaism, and their teachings are deeply rooted in the Jewish Scriptures and apocalyptic expectations of the time.
The New Testament writings, including the teachings of Jesus, emphasize the close relationship between the Father, the Son (Jesus Christ), and the Holy Spirit. Passages such as the Great Commission in Matthew 28:19, where Jesus instructs His disciples to baptize "in the name of the Father and of the Son and of the Holy Spirit," and the farewell discourse in the Gospel of John (chapters 14–16), where Jesus speaks extensively about the role of the Father and the Holy Spirit, highlight the early Christian understanding of a complex interrelationship between Father, Son, and Spirit. However, these writings do not articulate the doctrine of the Trinity in the explicit, formalized manner seen in later creedal formulations.