淨名經集解關中疏 2.393

2.393

阿難。有此四魔八萬四千諸煩惱門　而諸眾生為之疲勞。諸佛即以此法而作佛事　肇曰。三毒等分。此四魔煩惱之根也。因一根生二萬一千煩惱。合八萬四千。出無量塵垢故名門也。眾生皆以煩惱為病。而諸佛以之為藥。如婬女欲為患。更極其情欲然後悟道。毒龍以嗔必為患。更增其忿恚。此以欲除欲。以瞋除瞋。猶良醫以毒除毒。斯佛事之無方也。

"Ānanda, there are these four māras and eighty-four thousand gates of defilements, by which sentient beings are wearied and toiled; the Buddhas use precisely these dharmas to perform the Buddha's work." Sengzhao says: "The three poisons in equal parts—these are the roots of the four māras and defilements. From each single root twenty-one thousand defilements arise, totaling eighty-four thousand. Because they produce immeasurable defilements, they are called 'gates'. Sentient beings all consider defilements to be illnesses, yet the Buddhas use them as medicine. Just as when a courtesan's lust was a problem, [the Buddha] pushed her passions to the limit and only then did she awaken to the Way; and when a poisonous dragon's anger was inevitably a problem, he further intensified its wrath. This is removing lust by means of lust, and removing anger by means of anger, just as a good physician removes poison by means of poison. Such is the boundless versatility of the Buddha's work."