What is the substance of thought?

"What is the substance of thought? - 25 July 1975 What is the basic reason for thought to be fragmented? What is the substance of thought? Is it a material process, a chemical process? There is a total perception, which is truth. That perception acts in the field of reality. That action is not the product of thought. Thought has no place when there is total perception. Thought never acknowledges to itself that it is mechanical. Total perception can only exist when the centre is not."