Chapter 3 argues that the classical rhetorical tradition was a powerful tool for both European and non-European Jesuit missionaries seeking to advance the cause of Iberianized Catholicism. To do so, it places the Jesuit spiritual conquest of the Americas within the context of the Society of Jesus’ parallel efforts in Asia. More precisely, it follows the career of a Japanese Jesuit, Hara Martinho (c. 1568–1629), from his early education in the Jesuit college at Arima in Japan, to his participation in the Tenshō Embassy to Rome and finally to the crowning achievement of his humanist career, the delivery of his Latin panegyric oration to his fellow Jesuit students at Goa. While no Jesuit sermons in Japanese survive, there are several surviving Chinese sermons, which reveal that the classical rhetorical tradition could influence public speaking in East Asian languages. When taken as a whole, the case of this Japanese Cicero shows that the classical rhetorical tradition in its Renaissance humanist garb was a valuable weapon for Jesuit missionaries seeking to expand the boundaries of Catholicism in a much more militaristic way than most recent scholarship suggests.