I remember that many decades ago before I knew Christ personally, I read a book on prayer. The book told that prayer works. I thought that's good to know, but I wasn't really convinced. Today I see clearly that Jesus is all you need to know if you want to understand prayer and everything else spiritual. Know him to learn all truths from him directly. Become one with him and he will deposit all you need to know in your heart, and learning becomes effortless and a joy. Yes, you learn the sure way to get into heaven too.