c. 300–305
Greek
On the Mysteries of the Egyptians
De Mysteriis
Iamblichus of Chalcis · c. 245 – c. 325
An answer to Porphyry, who had asked why gods should need rites at all. Iamblichus replies that the soul cannot think its way up: it is joined to the divine by acts whose power lies in the acts themselves, not in the understanding of whoever performs them — names, stones, incense, and prayer.