" Plutarch, in the first century AD, mentions the pneuma (translated as “wind,” “air,” “breeze,” “breath,” or “inspiration”), and that occasionally the oikos was filled with a “delightful fragrance” as a result of the pneuma, but he does not describe its exact nature. Instead he relays a long-running argument among his friends about why the oracle is less active now than it was in the past. The arguments include less pneuma; the moral degeneration of mankind leading to its abandonment by the gods; the depopulation of Greece and the departure of the daimones (spirits) responsible for divination. But Plutarch also insists that the Pythia did not at any point rant or rave. Instead, he comments that, after a consultation session, the Pythia “feels calm and peaceful. "

― Michael Scott , Delphi: A History of the Center of the Ancient World