The need to resignify the foundations of theological work is an unavoidable task to guarantee that the good news announced can illuminate the new cultural sensitivities and historical junctures at the beginning of the century and millenium. From the history-oikonomia-theology triad, the account refers to the different paradigms seeking to advance in the understanding of the Trinitarian Mystery, giving priority to the relational paradigm. From this paradigm, an approach is made to the implications aiming to understand Trinity in a relational key of communion of love, as related to mystic experience, on which Christian life, Church life, and theology are based. The resignification of understanding the Trinitarian Mystery in a relational key of communion of love contributes, in the plane of Christian mystics, to the recognition of the presence and possibility of Divine communion by all believers in their own lifes.