妙法蓮華經文句 2.70

2.70

約觀心者，觀一善心具十法界，十界交互，具百法界，千性相等，十善即萬法，約八正道即八萬法門也（云云）。

Regarding the contemplation of mind: contemplating that a single wholesome thought possesses the ten dharma realms, the ten realms interacting possess a hundred dharma realms, a thousand natures and characteristics, and so on; the ten wholesomenesses are indeed the myriad dharmas, which in terms of the Noble Eightfold Path are eighty thousand dharma gates (and so forth).