Conrad Grebel probably experienced a conversion in the spring of 1522. His life showed a dramatic change, and he became an earnest supporter of the preaching and reforms of Zwingli. He rose to leadership among Zwingli's young and enthusiastic followers. This close following and enthusiastic support of Zwingli was challenged by the Second Disputation in Zurich in October 1523. Grebel and Zwingli broke over abolishing the Mass. Zwingli argued before the council for abolishing the Mass and removing images from the church. But when he saw that the city council was not ready for such radical changes, he chose not to break with the council, and even continued to officiate at the Mass until it was abolished in May 1525. Grebel saw this as an issue of obeying God rather than men, and, with others, could not conscientiously continue in that which they had condemned as unscriptural. These young radicals felt betrayed by Zwingli, while Zwingli looked on them as irresponsible.