At a jungle shrine in Ceylon last week, a group of local sadhus celebrated a rite of Hindu holy men: walking barefoot over a bed of glowing coals. To the Rev. Eric Robinson, a British Methodist missionary, it was the opportunity he had long been waiting for. Pulling off his shoes and socks, he stepped on the coals, walked the length of the burning pit himself. The doctor's verdict: severe burns on the feet, which confined Missionary Robinson to his bed for a week.