Plutarch,
Plutarch's Moralia — Isis and Osiris
(1927 & seq.)
“ Since, then, the air, of which we make the greatest use and in which we exist, has not always the same consistency and composition, but in the night-time becomes dense and oppresses the body and brings the soul into depression and solicitude, as if it had become befogged and heavy, therefore, immediately upon arising, they burn resin on their altars, revivifying and purifying the air by its dissemination, and fanning into fresh life the languished spirit innate in the body, inasmuch as the odour of resin contains something forceful and stimulating. ”
