Greek theologia (θεολογία) was used with the meaning "discourse on god" in the fourth century B.C. by Plato in The Republic, Book ii, Ch. 18.[14] Aristotle divided theoretical philosophy into mathematike, physike and theologike, with the latter corresponding roughly to metaphysics, which, for Aristotle, included discourse on the nature of the divine.[15]
Drawing on Greek Stoic sources, the Latin writer Varro distinguished three forms of such discourse: mythical (concerning the myths of the Greek gods), rational (philosophical analysis of the gods and of cosmology) and civil (concerning the rites and duties of public religious observance).[16]
Theologos, closely related to theologia, appears once in some biblical manuscripts, in the heading to the book of Revelation: apokalypsis ioannoy toy theologoy, "the revelation of John the theologos." There, however, the word refers not to John the "theologian" in the modern English sense of the word but—using a slightly different sense of the root logos, meaning not "rational discourse" but "word" or "message"—one who speaks the words of God, logoi toy theoy.[17]
Some Latin Christian authors, such as Tertullian and Augustine, followed Varro's threefold usage,[18] though Augustine also used the term more simply to mean 'reasoning or discussion concerning the deity'[2]
In Patristic Greek