St. John of God was very wild when he was young. He was a soldier in the army as Charles V and was also a mercenary. Though he didn’t have any religious beliefs while he was young, he sold religious books. After St. John of God had a vision of Jesus while he was in his 40s, he left the military and began caring for the sick, poor and homeless. St. John of God also converted the people he helped, and he founded the Order of Charity and the Order of Hospitallers of St. John of God. He is patron saint of booksellers, hospitals and those who work in hospitals.