Sometimes, Evangelicals struggle with the divine processions for various exegetical or metaphysical reasons. I argue that the Filioque clause of the Nicene-Constantinopolitan Creed (381) is theologically necessary for safeguarding the identities of all three Trinitarian Persons, and not just the Holy Spirit’s, as it renders all of their eternal relations as unique, identity-making relations. First, I shall motivate the problem of identity that the Filioque was meant to solve, namely the fear of modalism where the three Persons collapse into one Person due to sharing all divine properties alike. Second, I shall briefly explore the general metaphysics of internal relations, demonstrating how these kinds of relations enter into the beings of objects and contribute to their essences and identities. Third, I shall explain how the Filioque, in addition to eternal begottenness and eternal procession, provides each Person with a unique personal essence or identity, unshared with the others, and thus averting Trinitarian collapse. I conclude with a hypothesis of how Evangelicals can foster respectful dialogue with Eastern Orthodox believers who may have an aversion to the Filioque.