The one who lives in a gross dimension will find it very difficult to detect something subtle.
Unfortunately, most of us live in very gross dimensions; we find it very difficult to catch hold of, see, and witness thoughts, whereas it is far easier for us to do something with our actions.
You can watch your palm, right? It’s straightforward. But watching your thoughts is not so straightforward. So if you are to do something with your thoughts, it becomes difficult; it is possible only for someone who is living at a subtle level of life — which most of us aren’t.