What is this mind from which all things seem to arise and vanish? When everything sensations emotions and thoughts just comes and goes it all just seems like a dream.

Thoughts bring forth thoughts. We think so thoughts are there. They come from a place of no meaning. Because we believe that we are there, that is why they come up. Our mind at birth was holding onto nothing. So thoughts bring forth thoughts unendingly. That is why Rinzai said: “If you simply let the coming up thoughts be as they are, naturally they will disappear. And if there are those about what has not occurred yet, don´t bring your mind there.” In the Dhammapada it says: “Thoughts are like a car of fire, yet you are the one driving it.”