This footnote caught my attention more than the text this time.
From Reaching for the Invisible God:
Thomas Green, a priest who has spent his life exploring spirituality and has written seven books on prayer, makes an interesting observation. He estimates that about the same proportion of people have a very successful prayer life as have a very successful marriage. Tangibility is not the issue, he says, for tangibility does not ensure the success of human relationships either.
Now human relationships ARE tangible, but that isn’t what makes them successful. You spouse or friend is someone you can see and touch and talk to and hear with your own ears. But human relationships break down all the time. What makes them stick is “fidelity”, that is faith. Faith in the other person even when they fail or hurt you. Love and forgiveness. All of these are invisible things. The Lord has all of these things in abundance toward us. We reflect some of them back to him.