William Hasker (2013b) has constructed what is arguably the most developed three-self theory of the Trinity. As with Swinburne, his thoughts have developed over decades (Tuggy 2013b), but this entry will focus on his recent publications. For Hasker, following Plantinga, the Persons of the Trinity are “distinct centers of knowledge, will, love, and action…persons in some full sense of the term” (22; cf. Chapter 24). Hasker argues that such a view is widespread in ancient sources, including Gregor