What was a significant event that led Zwingli to become an advocate for reform?

Zwingli's advocacy for reform was significantly influenced by his exegetical sermons through Scripture. Through his deep engagement with the Bible, Zwingli came to realize the discrepancies between the practices of the Roman Catholic Church and the teachings found in Scripture. His sermons focused on interpreting biblical texts directly and emphasizing their authority, leading him to challenge existing church practices that he believed were inconsistent with Christian teachings. This method of exegesis not only informed his theological views but also spurred him to promote reform in the church, ultimately shaping the course of the Reformation in Switzerland. Zwingli's commitment to returning to Scripture as the foundation for faith and worship was a pivotal part of his journey toward advocating for substantial changes in the church.