When the Bible doesn't say something, it still says something. A life without prayer is a life without power. If someone reads the Bible, sooner than later they will begin to develop a prayer life because we will not agree with everything the Word of God says. However, the Word is right and we are not, so it is up to us to change. Prayer facilitates that change.
So in any relationship we must appreciate the similarities and respect the differences. This is tested in marriage possibly more so than any other relationship. What makes it crucial in marriage is we must find some common ground because walking away is not an option.