http://jkrishnamurti-sussex.info/quotes-on-thought/ How thought takes shape If one wants to see a thing very clearly, one’s mind must be very quiet, without all the prejudices, the chattering, the dialogue, the images, the pictures – all that must be put aside to look. What is thought made of? Is thought the cause of all division, of all fragmentation in life? What is thought made of? What is the substance of those pieces of thread woven into that complex cloth we call the mind? Thought is matter, probably measurable. And it comes from the accumulated memory, which is matter, stored in the brain. Thought has its origin in the past, recent or remote. Can one be aware of thought as it arises out of the past- the recollections of the past, the action of the past? Thought is matter Those who think a great deal are very materialistic because thought is matter. Thought is matter as much as the floor, the wall, the telephone, are matter. Energy functioning in a pattern becomes matter...
The ground - nameless, silence, call it what you like. It is there. And the mind wants to capture "that", to have relationship with it. Sorry, you can't. That's all!