When the movement of thought ceases there is no separation.
When the movement of thought returns there is still no separation.
Thought is but a wisp of smoke. Pre-awakening it obscures the truth, creating the illusion of separation when, in fact, there is no actual separation. Post-awakening, even when thoughts return, separation is not, both actual or apparent.
Thought is just black ink on a blank white page - the blank white page is one, when black ink comes the page is still one, and the black ink is one with the white page. There is no separation, period.
(This post was inspired by Jensen Ruehle)