The Dissertation aims to present the referred concept, in view of its relevance in the construction of the Trinitarian dogma. The relevance of the Cappadocian Fathers (Basilio de Caesarea, Gregório Nazianzeno and Gregório de Nissa) for perfecting, closing the gaps and making dogma concrete. In relation to the methodology used, the research analyzes, through bibliographic research, the primitive Christology, its biblical roots and the patristic reflection of the concept, the meaning of the term for the Fathers of the Church and for the Aryans, the historical context of the great councils ecumenical events from Nicaea (325) to Constantinople I (381), and the reflection of the Cappadocians. The main results of the research were, that the meaning of the concept of eternal generation in its origin, in the Sacred Scriptures, differs from its meaning in the dogmatic context. Origen, author of this concept, uses his allegorical interpretation to ratify it, and his interpretation will later influence both Nicenes and Aryans. Faced with an interregnum between the councils, the influence of the Roman Empire will contribute to the dissemination of both doctrine and heresy, strengthening both. In reflecting on the divinity of Christ and his origin, the Cappadocians reformulate the Trinitarian dogma inherited from the Nicene creed, also including the divinity of the Holy Spirit. The contribution of the research is presented with respect to what the term meant for Christian dogmatics, especially for the reflection on the Immanent Trinity, a subject that is a challenge in itself until today and its applications for a spirituality in favor from the other.