My father is a retired orthopaedic surgeon. He helped countless people over the years with their broken bones. One of the things that he repeatedly told me regarding his care for his patience is this: “I can set the bones straight, but only God can repair the bones.”
This is parallel to the task given to leaders in the church. They are given “for the equipping of the saints for the work of service” (Ephesians 4:12). Pastors can do all that they can do to equip (i.e. “set things straight” for) people. They can teach them the Bible. They can give them tools to study the Bible on their own. They can counsel them on righteous ways to live. They can model for them how to serve. They can suggest ways for them to serve. But ultimately, it is God who must work in their hearts to give them a heart to serve others.