Carl Gustav Jung, Psychology of the Unconscious… (1916)
“ Here the devil again puts into Faust's hand the marvellous tool, a phallic symbol of the libido, as once before in the beginning the devil, in the form of the black dog, accompanied Faust, when he introduced himself with the words " Part of that power, not understood, Which always wills the bad and always creates the good." United to this strength, Faust succeeded in accomplishing his real life task, at first through evil adventure and then for the benefit of humanity, for without the evil there is no creative power. ”
