 More’s attack on Glisson drew a response from the leading Presbyterian divine, Richard Baxter (1615–1691) (Henry 1987, Sytsma 2017). Glisson had been Baxter’s physician, so presumably Baxter knew him not to be an atheist, but Baxter was not motivated to defend Glisson merely by friendship. As a Calvinist, Baxter subscribed to a voluntarist theology and was appalled by the implications of More’s necessitarian theology. More’s rejection of Glisson’s theory depended upon his claim that matter had to be necessarily inert and that only spirit could be self-active—according to More, not even God could change this, because it was inherent in the very nature of matter that it must be inert, and definitive of spirit that it must be active. For Baxter this was an intolerable circumscription of God’s omnipotence on the mere whim of an all too fallible thinker. In a letter to More written in 1681, Baxter said,