The book content is about seeing the relationship between the narrow way and birth canal and to understand why Jesus said it is difficult and only a few people have found it. Every existing thing--men and animals--made their entrance into the world through the birth canal, an exit into God's kingdom must absolutely require a rebirth. The rebirth requires passing through a womb-like environment. In relation to the birth canal, infant passage through it only allows one at a time, even though there could be a twin or triplets in the womb. As the womb is necessary for the infant's preparation to make entrance into the world, so is being born again necessary for the adult believer, who must be prepared to exit into God's kingdom. The believer's age makes no difference. Neither does how long a person has been born again make any difference. This preparation to enter God's kingdom is what the author calls a 360 U-turn.