(7) Nocturnal birds were appropriate symbols of both sorcery and the secret divine sciences: sorcery because black magic cannot function in the light of truth (day) and is powerful only when surrounded by ignorance (night); and the divine sciences because those possessing the arcana are able to see through the darkness of ignorance and materiality. Owls and bats were consequently often associated with either witchcraft or wisdom. The goose was an emblem of the first primitive substance or condition from which and within which the worlds were fashioned. In the Mysteries, the universe was likened to an egg which the Cosmic Goose had laid in space. Because of its blackness the crow was the symbol of chaos or the chaotic darkness preceding the light of creation. The grace and purity of the swan were emblematic of the spiritual grace and purity of the initiate. This bird also represented the Mysteries which unfolded these qualities in humanity. This explains the allegories of the gods (the secret wisdom) incarnating in the body of a swan (the initiate).