Poor thoughts are those thoughts that lead to an infinite number of random uncontrolled thoughts.
High thoughts are those, or high thinking is that, in which thinking happens in such a way that thinking stops and an understanding happens. High thinking is that in which there is end of thinking and beginning of understanding. High thinking is one which does not remain for a long time. It sublimates into a silent understanding.
Poor thinking is an untamed thought which goes on expanding madly like a cancer and destroys everything.