The On Dreams of Synesius of Cyrene is one of the finest pieces of esoteric writing to survive from antiquity. It preserves fragments of the Chaldæan Oracles, conveys fully fleshed-out theories of veridical imagination, dream-divination, and magic based on kosmic correspondence, and gives us other valuable details of antique occult lore. It is also self-consciously an esoteric piece of writing, and seems to be suggesting that it is a polytheist message-in-a-bottle to be read by future generations, once the dark times of Christian persecution have passed. So we read it.