 Since most of Heytesbury’s logical views are spelled out either in the context or in terms of  obligationes,[5]  a brief note on these must be the starting point of their presentation. The most important passages are in [SCD] and [Soph] and to a certain degree in [RSS]. Three problems will be introduced: 1) the basic concepts, and in particular, relevance; 2) the distinction between metaphysical and epistemic possibility; and 3) the distinction between conceding a sentence and conceding that a sentence is true.