Pseudo-Dionysius the Areopagite: De coelesti hierarchia (c.500)

Athenians, I see how extremely religious you are in every way. For as I went through the city and looked carefully at the objects of your worship, I found among them an altar with the inscription, ‘To an unknown God’. What therefore you worship as unknown, this I proclaim to you. Acts 17. 22-34 Unknown: God …