I will put my laws into their mind, and write them in their hearts Hebrews 8:10 KJV
The point used here in the article is good, but it is not the original intent of understanding.
That verse is in the OT AND NT. What is it? IT is God’s statement of what the NEW COVENANT is.
Let me repeat that, That (and a little more, read it) IS Gods New Covenant with us.
The point is not to relax and think of nothing, what is the point?
The point is to watch the internal noise and thoughts, and not get caught up in them like a rushing stream. We cannot hear the "still, small voice" of the Spirit when we are caught up in our head.