A person can use his mind when working on matter; then logic is a great instrument. And the same person can put aside the mind when he moves into his meditation chamber and moves into the no-mind. Because mind is not you — it is just an instrument just like my hand, just like my legs. If I want to walk I use my legs, if I don’t want to walk I don’t use my legs. Exactly in the same way you can use the mind logically if you are trying to know about matter. It is perfectly right, it fits there. And when you are moving inwards, put it aside. Now legs are not needed; thinking is not needed. Now you need a deep silent state of no-thought.