There came a time when the devas, the gods of heaven, lost their strength and lustre through a sage’s curse, and the asuras pressed them hard in battle. Desperate, they went to Lord Vishnu, who gave them counsel no one expected: "Make peace with your rivals, for this task needs every arm. Churn the great Ocean of Milk, and from it will rise amrita, the nectar of immortality."
So gods and demons, enemies from the beginning of time, worked side by side. For a churning rod they took Mount Mandara itself; for a rope, Vasuki, the king of serpents, who wound his enormous coils around the mountain. The asuras took the head, the devas took the tail, and the churning began — the mountain spinning, the sea groaning, spray flying to the stars.
Almost at once the mountain began to sink into the sea floor, for it had no foundation. Then Vishnu took the form of Kurma, a tortoise vast as a continent, and slid beneath the waters, bearing the whole grinding weight of Mandara on his back. Steadied on that patient shell, the churning went on.
But the first thing the ocean yielded was not treasure. Out of the depths boiled halahala, a poison so terrible that its fumes began to wither all the worlds. Gods and demons alike fled in terror — and it was Shiva, the ever-compassionate, who came forward, gathered the poison in his palms, and drank it. His consort Parvati pressed his throat so the poison would go no further, and it lodged there, staining his neck a deep blue. Ever since, he has been called Neelakantha, the Blue-Throated, and the worlds have lived because he was willing to hold their pain.
Then, slowly, the sea began to give its gifts: Kamadhenu the wish-granting cow; Ucchaihshravas the white horse; Airavata the four-tusked elephant; the Kaustubha gem; the Parijata tree whose flowers never fade; and then, seated on an open lotus, Lakshmi herself, goddess of fortune, dazzling as lightning — who looked over all the assembled beings and garlanded Vishnu, choosing him forever.
Last of all rose Dhanvantari, the divine physician, holding the golden pot of amrita. The asuras snatched it and fell to quarrelling; then Vishnu appeared among them as Mohini, a form of such bewildering beauty that they handed her the pot to divide, and she served the nectar to the devas until it was gone.
The elders who tell this story always end it the same way: when you churn for what is most precious — in the world, or in your own heart — the poison rises first. Do not stop churning. And be grateful there are those who will drink the bitterness so that others may live.