大乘起信論裂網疏 3.5

3.5

問：即謂妄念不離無漏種子，亦何不可？答：約真如門理實無礙。約生滅門，則無漏種不生有漏現行故也。況無漏種亦非真如之外別有實法，但此真如理性，雖無始來從未曾悟，法爾有此應正了知之理，即目此法爾應正了知道理名為無漏種子。今無明但是不了真如而起，非謂應正了知道理之上反能生於不正了知也。

Question: What would be wrong with saying that deluded thoughts are not separate from untainted seeds? Answer: In terms of the aspect of tathatā, the principle is truly unimpeded. In terms of the aspect of arising and ceasing, however, untainted seeds do not give rise to tainted active manifestations. Furthermore, untainted seeds are not real phenomena existing outside of tathatā; but although this principle-nature of tathatā has never been awakened to from beginningless time, there is spontaneously this principle that ought to be correctly understood, and just this principle that ought to be spontaneously and correctly understood is named untainted seeds. Now, ignorance merely arises from not understanding tathatā; it does not mean that from the principle that ought to be correctly understood, incorrect understanding can conversely be produced.