In Master Dogen's Shobogenzo Genjo-Koan.we find:
To study the Buddha way is to study the self. To study the self is to forget the self. To forget the self is to be actualized by myriad things. When actualized by myriad things, your body and mind as well as well as the bodies and minds of others drop away. No trace of realization remains, and this no trace continues endlessly.
"The place where everything is dropped, the action-non action of dropping things and self away, is what the 8th picture is about. All things go through that motion and dance, the dance of impermanence, forms have to go through that gateless gate where all reference points vanish to arise again. To truly and absolutely meet a tree, a flower, a friend, a sound, you have to go through the process where you forget totally anything about what is a tree, a flower, a friend or a sound. Otherwise, you would only meet dusty labels, names, memories, beliefs.""Dropping body-mind, forgetting the self is the roundness of the moon, this fully ripe moon which is also the true face of sitting. No trace of realization to be found there, for you are sitting as the very moonlight. The light doesn't see itself. But indeed, the light is seen all around, endlessly shining in countless things."