"As for these present appearances of stones and rocks, mountains and forests, trees and plants, and so forth, do not believe them to be anything at all, and do not assert them to be anything at all. Do not deny what appears, and do not assert them to be or not to be. Their appearance is a natural appearance, and their... emptiness is a natural emptiness. Like the identity of space, let their identity be naturally empty, and let their appearance be devoid of a self-nature."
--Padmasambhava