Throw away all opinions, all likes and dislikes, and keep only the mind that doesn't know.  The mind that doesn't know is the mind that cuts off all thinking. When all thinking has been cut off, you become empty mind.  This is the mind before thinking.  Your mind before thinking, my mind before thinking, all people's minds before thinking are the same.  This is our substance.   Your substance, my substance, and the substance of the whole universe are one.  So the tree, the mountain, the cloud and you become one (restated from Seung Sahn, Dropping Ashes On The Buddha),