Sokuzan reads from a book of poems by early Buddhist nuns called "The First Free Women". A line from Patacara’s poem says, “Just see all thoughts, words and actions arising all by themselves.” This is a good way of saying what’s happening in the mind stream. You could look at this yourself by sitting down and holding still. Just a little bit of casual movement disrupts the observer of the mind stream. Inside and outside is a misunderstanding; the true understanding is you won’t see anything.
https://www.youtube.com/watch?v=bKY4N2eMJBY