This work illustrates that theologians John Richardson Illingworth and William Temple represent, paradigmatically, the main strands of trinitarian theology found in the eastern and western churches. The extent to which Illingworth represents a so-called social trinitarian approach, a Temple a so-called psychological one is examined. The book is theological rather than biographical, and as such it studies their respective trinitarian theologies. It reveals not only that English theology has something important to offer, but that a comparison of two of its representatives from different generations opens up aspects of the relationship. These findings are used in conversation with the contemporary trinitarian scene.