On one particular day I watched a preacher give his sermon. I don't necessarily remember the sermon he shared with the world that day, however I do remember his sales pitch at the end. He was selling his latest book. He wrote a book on prayer. In advertising his latest book he said words I have never forgotten to this day; "You do not know how to pray until you read my book."
That one sentence confused my teenage self. I didn't understand that statement. What was in his book that was so important that wasn't in the Bible?
Now as an adult, I'm aggravated and saddened that christian's would make such claims to sell a book. Those false statements may lead people away from the Bible and seeking it's teaching.
Let me remind you that Jesus gave us a model prayer to use as a guideline for praying in Matthew 6:5-13...