After this experience John Sung now felt that he possessed more strength and enthusiastically preached the Gospel to people he met. John became a radically changed man and began to preach fervently to his peers and lecturers in the seminary. It was such a drastic change in the man that his fellow liberal theology students reckoned that he had gone out of his right mind, and the seminary authorities confined him in an insane asylum, where he stayed for 193 days.