The author's work is extremely rich. Beyond the issues that I have discussed, the author makes a variety of illuminating connections between his own work and the efforts of Aristotle and Hegel to understand Being. More importantly, the author attempts to portray a variety of structural relationships between locations on the map [of Being] using the two Aristotelian causal relations that have not been discussed [in the context of Category Theory]—efficient cause and final cause. These add yet more complexity and unity to the map of Being.

John Hawthorne
Oxford University