That's a great question that I had to address by email, recently. The answer depends on how we look at prayer and our relationship with God. This is what I shared in that email to help the person that asked about it. I’ve only changed the wording slightly to fit a larger audience in this post. And this isn’t an exhaustive study, but just an overview. But I think there’s enough meat here to keep us all praying as God would have us to.
I think of prayer as half of my conversation with God. Just like with my earthly father. His response back is often in words by His Word. But it could be in the form of His response. We'll get to that.