The fourth son begged to be forgiven as this was a thing he could by no means consent to. An old man had to seek the help of others even to keep his body clean, a most pitiful plight. No, much as he loved his father he could not do it. Yayati was struck with sorrow at the refusal of the four sons. Still, hoping against hope, he supplicated his last son who had never yet opposed his wishes: "You must save me. I am afflicted with this old age with its wrinkles, debility and grey hairs as a result of the curse of Sukracharya. It is too hard a trial! If you will take upon yourself these infirmities, I shall enjoy life for just a while more and then give you back your youth and resume my old age and all its sorrows. Pray, do not refuse as your elder brothers have done." Puru, the youngest son, moved by filial love, said: "Father, I gladly give you my youth and relieve you of the sorrows of old age and cares of state. Be happy." Hearing these words Yayati embraced him. As soon as he touched his son, Yayati became a youth. Puru, who accepted the old age of his father, ruled the kingdom and acquired great renown. Yayati enjoyed life for long, and not satisfied, went later to the garden of Kubera and spent many years with an Apsara maiden. After long years spent in vain efforts to quench desire by indulgence, the truth dawned on him. Returning to Puru, he said: "Dear son, sensual desire is never quenched by indulgence any more than fire is by pouring ghee in it. I had heard and read this, but till now I had not realised it. No object of desire, corn, gold, cattle or women, nothing can ever satisfy the desire of man, We can reach peace only by a mental poise beyond likes and dislikes. Such is the state of Brahman. Take back your youth and rule the kingdom wisely and well." With these words Yayati took his old age. Puru, who regained his youth, was made king by Yayati who retired to the forest. He spent his time there in austerities and, in due course, attained heaven.