 Abstracting from specific putative applications of metaphysical explanation outside of metaphysics proper, can one say in more general terms what the extent of metaphysical explanation is? On one extreme, proponents of the famous  “principle of sufficient reason”  contend that everything (or everything of a certain sort, e.g., contingent facts) has an explanation of some form or other, and Dasgupta (2016) has prominently developed a version of the principle regarding metaphysical explanation, specifically grounding explanation on his view. Notably, Dasgupta distinguishes between two ways that metaphysical explanation might be limited in extent. Call a substantive fact one that is “apt for being grounded”, in the sense that