In this essay, I explore correspondences between the natural and spiritual worlds in relation to concepts and measures of ecological science, especially those of species diversity and community structure in nature. This includes perspectives on variety and communities in the spiritual world as described in Swedenborg’s Writings for the New Church. First I will define diversity and variety as general terms, then as they compare to Swedenborg’s use of the terms, and finally in terms of ecological science. The discipline of correspondences is reviewed and dealt with, using diatoms (my favorite research organism), and paleoecology (the study of past ecosystems), as examples. Included is a survey of the specific uses of the study of correspondences as described in Swedenborg’s publications and the applicability of that study for philosophy and science courses. The theological Writings of Emanuel Swedenborg (1688–1772) contain a new revelation for understanding God and our relationship with God; these teachings have been important in the establishment of the New Church (also known as the Swedenborgian Church). Swedenborg writes that there is an internal sense or spiritual meaning to Scripture that is not generally known.