“Then Samuel told the people the manner of the kingdom, and wrote it in a book, and laid it up before the LORD. And Samuel sent all the people away, every man to his house.” I Sam 10:25
Samuel wrote a book that taught people how to respect royalty. This book is not in your bible. Israel would have never needed this book if they would not have insisted on a king. Before Samuel wrote this book, the books of Moses is what Israel had for their rule of living. The church kind of does something similar today. What happens when a denomination starts up? They right their own book of bi-laws. Just as the five books of Moses were sufficient for Israel until they demanded a king, so too should our bible be sufficient for our day.