大乘起信論裂網疏 5.59

5.59

"Question: All sentient beings and all dharmas are identical with the one dharmadhātu, without two marks. In terms of the principle, one should merely be correctly mindful of tathatā. Why must one additionally cultivate all good practices and rescue all sentient beings? Answer: It is not so. Just as the mani jewel is intrinsically clear and clean in nature, yet lies within ore and defilement. If someone diligently remembers it but does not employ skillful means and does not apply effort, seeking purity will ultimately be unattainable. The dharma of tathatā is also like this: its essence, though clear and clean and fully endowed with merits, is defiled by boundless adventitious defilements. If someone diligently remembers it but does not employ skillful means and does not cultivate all practices, seeking purity will ultimately have no reason to be attained. Therefore, one must accumulate all good practices and rescue all sentient beings, separating from those boundless adventitious defilements and stains, and manifesting the true dharma."