華嚴經義海百門 1.27

1.27

七、入不二者，謂見塵與心有二，二即無二也。若執塵心為一，遮言不一，以迷心所見，非無緣故。若執塵心為二，遮言不二，以離心外無別塵故。由心與塵二即無二，唯心無體，一亦無一。由一無一，由二無二，一二無礙現前，方入不二，當經云「無二智慧中，出人中師子。不著一二法，知無一二故。」

Seventh, entering non-duality: this means that seeing duality between the dust mote and the mind is such that duality is non-duality. If one clings to the dust mote and the mind as one, this is negated by saying they are not one, because what is seen by the deluded mind is not without conditions. If one clings to the dust mote and the mind as two, this is negated by saying they are not two, because apart from the mind there is no distinct dust mote. Since mind and dust mote being two is non-duality, and the mind alone has no essence, oneness is also non-oneness. Because oneness is non-oneness and duality is non-duality, when oneness and duality manifest unobstructed before one, one then enters non-duality. As the sūtra says: "In non-dual wisdom, / the lion among men emerges. / Not clinging to the phenomena of oneness or duality, / because he knows there is neither oneness nor duality."