The Christian population had churches, clergy, and a bishop, but there were few preachers and no priests beyond the walls of Goa. Xavier decided that he must begin by instructing the Portuguese themselves, and gave much of his time to the teaching of children. The first five months he spent in preaching and ministering to the sick in the hospitals.  After that, he walked through the streets ringing a bell to summon the children and servants to catechism.  He was invited to head Saint Paul's College , a pioneer seminary for the education of secular priests, which became the first Jesuit headquarters in Asia.