How Can I Start Conversations with Postmodernists about the Need for Repentance?

Questions about how to start conversations with postmodernists about the need for repentance and what question one can use to put a stone in the shoe of a Buddhist friend.

• In a postmodern world, what tools can believers use to start a conversation about the need for repentance?
• What question can I use to put a stone in the shoe of my Buddhist friend?