ABSTRACT
This chapter argues that Ernst Haeckel's monism is of the pluralistic variety in part because he outlines a triune structure of substance that includes material, energy, and experience "all the way down". For Haeckel the worst philosophical sin was that of assuming some form of ontological dualism, and he thought the church was the worst offender and propagator of this mistake. For Haeckel, an evolutionary perspective meant, among other things, that anything one might think of as a priori must in fact be an a posteriori idea/fact/concept whose bio-historical construction has just been covered over by time. He was flustered by the fragmentation of chemical, biological, and physical sciences in the nineteenth century and understood evolutionary theory as a way to finally bring these multiple perspectives on "nature" together into a single worldview. The chapter discusses Haeckel's version of Non-Reductive Religious Naturalism, particularly from within our planetary context in the twenty-first century.
