Buddha – mind – is (not, ‘is like’) mountains, rivers, and the earth, the sun, moon, and stars. Mind is houses and streets, animals, guns, plants, thoughts, bombs, corpses, laughter, and cancers. Mind is all particular dharmas as they are; particular dharmas. All particular dharmas are this mind as it is; this mind. This tree is the mind as it is, the mind as it is, is all dharmas, hence is this tree. That this tree is mind ‘as it is,’ means mind only exists as mind by virtue of this tree existing as this tree. Because this tree is mind ‘as it is,’ it actually goes too far to say ‘is mind,’ and is more accurate to simply say ‘this tree.’ As Dogen puts it:
Mind as mountains, rivers, and the earth is nothing other than mountains, rivers, and the earth. There are no additional waves or surf, no wind or smoke. Mind as the sun, the moon, and the stars is nothing other than the sun, the moon, and the stars.
Shobogenzo, Soku-shin-ze-butsu [Gudo Nishijima & Mike Cross]
Excerpt from, Zen Cosmology: Dogen’s Contribution to the Search for a New Worldview pp.94-95