起信論疏筆削記 8.5

8.5

此顯下，二、揀濫。如說依水有波，意顯所依之水全起，成能依之波；不同依母有子，非全母成子，能所別故。斯則舉一法以竪論，非約兩法橫說。以此下，出所以。以是所依之真起，成能依之妄故，得有覺不覺二義。以有二義故，遂以不覺妄法顯示覺義之中三大也。如水起成波已，而動濕兩全，以有動濕故，遂能以動顯於濕也。若言依母有子，母不在子中，以不在中故，不能以子顯母。是故下，結成上義所依，即如來藏。

'This reveals…' and so forth is the second, eliminating confusion. It is like saying that waves exist in reliance on water, the intent being to show that the water that is relied upon entirely arises to become the waves that rely; it is not like a child existing in reliance on a mother, where the mother does not entirely become the child, because subject and object are distinct. Thus, this is a vertical discussion adducing a single dharma, not a horizontal explanation regarding two dharmas. 'Because of this…' and so forth brings forth the reason. Because it is the real that is relied upon that arises to become the deluded that relies, there can be the two meanings of enlightenment and non-enlightenment. Because there are these two meanings, the three greatnesses within the meaning of enlightenment are then revealed by means of the deluded dharma of non-enlightenment. Just as after water has arisen to become waves, motion and wetness are both fully present; because motion and wetness are present, one can then reveal the wetness by means of the motion. If one were to say that a child exists in reliance on a mother, the mother is not within the child; because she is not within, one cannot reveal the mother by means of the child. 'Therefore…' and so forth concludes and establishes that the above meaning of that which is relied upon is precisely the tathāgatagarbha.