Yet even after the parameters of orthodoxy were established, Christian thinkers continued to face difficult philosophical questions about the meaning, coherence, and plausibility of settled Christian doctrines. They continued to try to answer those questions using the best philosophy of their day—from Scholastic Aristotelianism in the Medieval period to analytic metaphysics today. For Christian thinkers, the already settled doctrines of Christian orthodoxy provide a normative framework within which this philosophical reflection occurs, by demarcating the logical space that constrains the field of acceptable solutions. For example, it is not open to an orthodox Christian thinker to dispel the logical problem of the Trinity (the problem of how God can be both three and one) by arguing that there is in fact no God, or that God is not triune, or that the Father and the Son are two stages in the temporal life of the one God. These theoretical options are ruled out by virtue of the philosopher’s own orthodox Christian commitments.