The Patriarch's Pride
Daksha was one of the great progenitors of mankind, a man of immense power and pride. He had a complicated relationship with his son-in-law Shiva — the wild ascetic who sat on a mountain with matted hair, smeared in ash, surrounded by ghosts and outcasts, was not what Daksha had envisioned for his beautiful daughter Sati.
Daksha held a great yajna, a sacrifice, and invited all the gods and all his family. He deliberately did not invite Shiva.
Sati Goes Alone
Sati, hearing of the great sacrifice at her father's house, wanted to attend. Shiva warned her gently: "Your father has not invited us. It will not go well."
Sati was too certain of her father's love. "Whatever he may think of my husband, he loves me. I will go."
She went. She was met not with the warmth she expected but with her father's public, deliberate contempt for Shiva — spoken in front of all the assembled gods.
The Fire
Sati stood and listened to her husband being insulted by her father in a room full of the great ones of heaven and earth. The love she bore for Shiva — which had been her entire being since she was born, which she had prayed for in a previous life, which was the defining fact of her existence — was being trampled in front of an audience.
She looked at her father. She said:
"This body was given to me by you. Since you have used it to insult the Lord I love, I cannot keep it."
She entered the yajna fire. She died where she stood.
The Grief That Shook the World
When Shiva heard, he went beyond all grief. He came to the sacrifice, killed Daksha, took Sati's body, and walked with it. The grief of the great god was so immense that the cosmos itself trembled.
Vishnu sent his Sudarshana Chakra to gently, out of compassion, dismember Sati's body — piece by piece — as Shiva walked, so that the Lord would eventually have nothing left to carry.
Wherever a part of Sati's body fell, that place became a Shakti Pitha — a seat of the goddess. There are 51 such places across the Indian subcontinent, each sacred to this day.