Master Dogen asked “ If the cart is stuck, do you beat the ox or beat the cart?”
In other words, what is zazen? Is it an effort to purify the mind, or is it the full effort of this body of practice to express itself fully?
And in his greatness, his unique position, he answers “the cart”.
This body of practice is not the pictured lump of flesh, it is our actual experience. Freed from this picture, whether “the mind” is agitated or peaceful is of no consequence; it is like an electron in a cathedral.