華嚴經探玄記 7.19

7.19

第二放光中，兩膝放者，過前足指，表行漸勝故也。又膝有屈申進趣用，表迴因向果進昇之相故也。於中四：一出處、二光數、三所照、四緣見。謂因時同行、果時感會，故見也。

In the second [part], on emitting light, emitting from both knees surpasses the toes [of the feet] from before, symbolizing that the practices are gradually superior. Moreover, the knees have the function of bending, extending, and advancing, symbolizing the aspect of dedicating the cause toward the fruit and progressing upwards. Therein are four: 1. the point of emergence, 2. the number of lights, 3. what is illuminated, 4. seeing through conditions. That is, having practiced together at the time of the cause, they are sympathetically united at the time of the fruit; hence they see it.