大方廣佛華嚴經隨疏演義鈔 34.69

34.69

疏「即體之用故問之以知」下，會違。謂前問問知，今答性淨，都無知言，何以會通？故為此會。故水南善知識云：「即體之用名知，即用之體為寂。如即燈之時即是光，即光之時即是燈。燈為體，光為用，無二而二也。」「知之一字眾妙之門」，亦是水南之言也。「若能虛己」下，勸修。即可以神會，難以事求也。能如是會，非唯空識而已，於我有分也。

Regarding the Commentary's passage from "Because it is the function of the essence, it was questioned with knowing" onward, it reconciles a discrepancy. That is, the earlier inquiry asked about knowing, whereas the present answer addresses purity of nature without any word about knowing; how can they be reconciled? Hence this reconciliation is made. Therefore, the spiritual friend of Shuinan said: "The function of the essence is called knowing; the essence of the function is quiescence. Just as when it is a lamp, it is light; when it is light, it is a lamp. The lamp is the essence, the light is the function—not two, yet two." "The single word 'knowing' is the gate of all marvels" is also a saying of Shuinan. From "If one can empty oneself" onward, it encourages practice. That is, it can be grasped spiritually, but is hard to seek through phenomenal things. If one can comprehend it like this, it is not merely empty intellectual knowledge; it pertains to oneself.