" Brahma had decreed that demon Daruka would not die at the hands of a man, beast, or god. This left him vulnerable only to attacks by women. The devas, tormented by Daruka, sought the aid of the goddess Parvati, who immersed herself in the poison locked in Shiva’s throat and transformed into Kali, the dark one. When she returned to Mount Kailas after killing the demon, her skin was black, her eyes red, her teeth like fangs, her tongue blood smeared. She hardly looked like a wife. Shiva laughed. Hurt, the goddess performed austerities, bathed in a river, and transformed into Gauri, the bright one. Her golden skin, shapely eyes, pearllike teeth, and smile aroused Shiva. He embraced her and they made love. Shiva Purana, Linga Purana "

― Devdutt Pattanaik , The Goddess in India: The Five Faces of the Eternal Feminine