When we knock on a door, we are usually hoping for an answer. There is something we are looking for or wanting to find. The Gospel also creates a picture of this. When Jesus begins to knock on the hearts of people, He is looking for a relationship with us. Scripture also tells us that when we knock, the door will be opened to Him and His plans for us.
Like all our Gospels of John, the booklet includes a plan of Salvation and a decision page. A QR code on the back provides a quick link to learn more about God.