This article explores Gregory Baum's notion of how the Holy Spirit leads the church to a new understanding of Jesus as the Christ. It begins by examining Baum's interpretation of the doctrinal development at Vatican II, then analyzes the innovative understanding Baum has developed based on how the Spirit works to reformulate the church's message through a process of cultural conversion. It relates Baum's theory to preceding reflection on the development of dogma, then takes up Rosemary Ruether's criticism that Baum's position deprives Scripture of its transcendence. It concludes by developing a way of relating Word and Spirit that combines Baum's openness to the spirit with Ruether's concern for the transcendence of Scripture.