Yayati's Life of Austerities in the Forest
After giving his throne to his youngest son, King Yayati retreats to the forest and begins a life of extreme penance. He survives on ever-diminishing sustenance — from roots to water to air — performing feats of endurance that culminate, after a full millennium, in his ascent to heaven.
Having instated his youngest son, Puru, on the throne, King Yayati cast aside his other sons — with Yadu at their head — and happily retired to the forest. His kingship was over. His new life was one of subtraction.
He lived in the forest for a long time, his diet reduced to roots and fruit. He paid homage to the gods and the ancestors. He conquered his rage and controlled his senses. He poured offerings into the fire, following the prescribed rites for those who retire to the forest. He worshipped his guests by offering them forest food and ghee. His own sustenance came from gleanings of corn and the remnants of food left by others.
This was the foundation. Then the austerities began in earnest.
For a full thousand years, he maintained this disciplined forest life. Then he pushed further. For thirty autumns, he lived on water alone, controlling his mind and speech. For one year, he lived on air, without sleeping. For another year, he performed austerities amid the five sacred fires. For six months, he stood immobile on one leg.
The progression was a systematic dismantling of bodily need: from food, to water, to air, to stillness itself. Each stage was a vow, a sacred deed performed without deviation. The goal was not merely purification, but a transaction with the cosmos — tapas (austerity) generating spiritual heat, which could be exchanged for a celestial reward.
After the final trial — standing on one leg for half a year — the transaction was complete. The performer of sacred deeds then ascended to heaven.