十不二門指要鈔 2.102

2.102

初、帶諭彰用匪功成者，故知心鑑本明、三千之像本具。對物未能現者，蓋三惑之塵所遮，去塵雖緣、了之功，現像乃全由性具，此中正明觀心發用。他云，由機現像。其義天隔。觀法大旨者，非唯此中，諸門皆爾，但在此說為便耳。

First, using an analogy to show that function is not [merely] accomplished through effort: therefore one knows that the mind-mirror is fundamentally bright and the images of the three thousand are fundamentally possessed. That they cannot yet appear before creatures is covered by the dust of the three delusions. Although clearing the dust is the efficacy of the conditioning and revealing [causes], the manifestation of images derives entirely from inherent possession in the nature. Here it directly clarifies that contemplating the mind activates function. Others say that the appearance of images derives from capacities—their meaning is separated by heaven and earth. The essential purport of the contemplation method is not only here; all gates are like this, but it is convenient to explain it here.