First principles and the challenge of Parmenidean monism -- St. Thomas on Analogia entis in the Scriptum super sententiis and in De veritate -- Consideration of objections to the view that the Analogia entis is the analogy of proper proportionality -- The analogy of being and the transcendence and analogical intelligibility of the act of faith -- Appendix : a (very) few words regarding metaphysics, Separatio, and Abstractio