Who Kali is
Kali is the goddess who frightens people and is loved by them anyway. She is black, naked but for a garland of heads and a skirt of arms, with her hair loose and her tongue out, a sword in one hand and a head in the other, and she stands on Shiva, who lies under her like a dead man.
In the Devi Mahatmya she comes out of the goddess Durga's forehead, black with anger, in the middle of a battle, to kill the demons Chanda and Munda, and then the demon Raktabija, whose every drop of blood became another of him, until she drank the blood before it touched the ground. In the Linga Purana she is Parvati coming out of the poison in Shiva's throat to kill the demon Daruka. In both, her anger outlasts the enemy, and has to be calmed.
Her name is the feminine of kala, time, and also means the black one. She is time, which eats everything, and the burning ground, where everything ends, and so she is free of fear, and gives freedom from it. Her right hands say exactly that: do not be afraid.
In Bengal she is above all Ma, the mother, worshipped on the new moon of Diwali, and sung to by poets who speak to her as a child speaks to a difficult mother.
Om krim kalikayai namah: the seed syllable of Kali, the first sound of her mantra.

