 He entered the Society of Jesus, and Ignatius Loyola sent him with eleven other Jesuits to Bohemia to combat heresy there, and to sustain a public discussion with the disciples of Martin Luther and Hus.In 1556 he became professor of theology and Hebrew at the Jesuit college at Prague.To continue the work of public lectures which he began, he gave a Sunday course of polemics to the clergy and laity.