妙法蓮華經玄義 2.64

2.64

妙悟之時，洞知法界外無法而論絕者，約有門明絕也。是絕亦絕，約空門明絕也。如快馬見鞭影，無不得入，是名絕待妙也。用是兩妙，妙上三法。眾生之法，亦具二妙，稱之為妙。佛法、心法，亦具二妙，稱之為妙。

At the time of subtle awakening, penetratingly knowing that outside the dharma realm there are no phenomena and thereby discussing cutting off: this explains cutting off in terms of the gate of existence. That this cutting off is also cut off: this explains cutting off in terms of the gate of emptiness. Like a swift horse seeing the shadow of the whip, there is none that fails to enter; this is named the subtlety of cutting off relativity. Using these two subtleties, one subtilises the three phenomena above. The phenomena of sentient beings also possess the two subtleties and are called subtle. The Buddha-dharma and the phenomena of mind also possess the two subtleties and are called subtle.