 On two counts, then, this makes him not a trinitarian –- that the “persons” are neither co-equal nor equally divine'.Origen's "On First Principles" ("De Principiis" or "Peri Archon") is the oldest extant Christian theological treatise.Origen's theology of the godhead is developed in this treatise, which reveals that by this time the use of the word Trinity to refer to Father, Son and Holy Spirit is standard in orthodox churches.