This is fun illustration that you can use for teenagers and adults when you talk about being certain of something. Sometimes we totally believe that we are right even when we're not.
When you use the gimmick that I demonstrate in the video below it will open the conversation. Hopefully it will help you talk about the truth of the Bible, what is faith?
How can you be certain about something?
The truth of the Scriptures, being certain about something, what is faith?