The apophatic (negative) theology of the Neoplatonism of Plotinus and some pre-Pseudo-Dionysius eastern Christian thinkers.
Written when I was 23 for an undergrad course on religion in the ancient world. Contains no mention of the Bahá'í Faith. (It also is my oldest paper written on a computer that survived the floppy-disc era!)
See a continuation of this study in the Eastern tradition in my Buddhism thesis.