Why did Swami Vivekananda die from human disease?

Why did Swami Vivekananda die from human disease? Why didn't he cure himself by the power of body control that he gained from meditation? The Sages accept disease and death as a natural course of life. The Gnanayogis are indifferent. The Bhaktayogis surrender. The Karmayogis and the Rajayogis may endeavor to cure but still surrender the results to God and life. We can place a million arguments against these but they seem to know life and death infinitely better than us. Swami Vivekananda contributed so much to the world in such a short span of life that regular mortals like you and me could not in a million years. What does he need from this world, to keep frantically extending this piece of life? Beggars need more, that one more morsel, that one more moment of indulgence, that one more feast even when they cannot clean their own motion, and that one more day of life even when a single finger cannot be moved… The brave king comes to give to his people all he can, and departs in style and joy when his moment comes! Swamiji came to give, he gave it all and went off giving a king-size goodbye to his loved ones. That was a cyclone of grace for humanity! Well, a few mortal details for the curious cat in us … He consciously died, and he prophesied long back that he would not live beyond 40, and he died when he was 39. I am glad Wikipedia has such apt details- On 4 July 1902 (the day of his death), Vivekananda awoke early, went to the monastery at Belur Math and meditated for three hours. He taught Shukla-Yajur-Veda, Sanskrit grammar and the philosophy of yoga to pupils, later discussing with colleagues a planned Vedic college in the Ramakrishna Math. At 7:00 pm Vivekananda went to his room, asking not to be disturbed; he died at 9:20 p.m. while meditating. According to his disciples, Vivekananda attained mahasamādhi; the rupture of a blood vessel in his brain was reported as a possible cause of death. His disciples believed that the rupture was due to his brahmarandhra (an opening in the crown of his head) being pierced when he attained mahasamādhi. Vivekananda fulfilled his prophecy that he would not live forty years It is not how a man dies, but how he lives for the cause of others, and Swamiji’s life was phenomenal at that!