No Substantial Content
Why, precisely, is it not possible to stop negative thoughts or start positive?
For precisely the same reason that it is not necessary.
What do you mean, there is no need to stop the one and start the other?
In a dream, the idea of putting a stop to something negative and promoting something positive occurs. Why?
It is with reference to negative appearances that the idea of "bringing to an end" comes up. And it is with reference to positive appearances that the idea of affirming and promoting comes up.
As long as one does not recognize that it is a dream, the idea of negating the one and affirming the other predominates and is also needed.
When you see that the whole thing is a dream experience, there is nothing to negate and nothing to affirm, because the appearances, negative as well as positive, have no substantial content. So there is nothing for the idea of negating or affirming to relate to.
Composed by Khenpo Tsultrim Gyamtso Rinpoche, at Rocky Mountain Dharma Center, in the summer of 1991. Commentary on Ocean of True Meaning.
Translated by Jim Scott.