John Calvin modified the meaning of “very God of very God” in the Nicene Creed. Restricting eternal generation to the Son’s personhood without the communication of the divine essence from Father to Son, controversy erupted over his views for the next two hundred years or so. Calvin’s views of eternal generation became widely accepted from the nineteenth century onward, and only recently are historians and theologians realizing that Calvin’s views of the Son’s aseity were eccentric. Despite growing historical awareness, however, dogmatic theologians often stop short of evaluating Calvin on eternal generation. This paper argues that John Calvin’s teachings on eternal generation do not cohere well with standard Christian Trinitarian theology and exegesis. After getting readers up to speed with some historical questions about Calvin’s Trinitarianism, and showing how modern authors often carefully sidestep his views, this essay offers both a historical and Scriptural critique. The author’s aim here is a long-overdue dogmatic assessment of Calvin on aseity and eternal generation in the Trinity.