大方廣佛華嚴經疏 17.21

17.21

第二「爾時」下如來放光分。文義有六：一時、二主、三處、四數、五相、六業處。謂兩足指足指拒地得住有力，成位不退而行有恒，數位過前加於千也。相表解顯，故云妙色。普照十方，顯佛眾會。一光照於一切，則一切亦爾，重疊無礙無不互見，為一法界圓明大會。

Second, from "At that time" onward, the section on the Tathāgata emitting light. In the text and meaning there are six points: 1. Time; 2. Lord; 3. Place; 4. Number; 5. Mark; 6. Sphere of activity. It refers to the two toes: the toes pressing the ground enables stable standing with power, accomplishing non-retrogression in the station and constancy in practice. The number exceeds the previous, adding a thousand. The mark signifies the revelation of understanding, hence it says "wondrous color." It universally illuminates the ten directions, revealing the Buddha's assemblies. One light illuminating all means that all are also like this; overlapping without obstruction, there is none that does not mutually appear, constituting the great assembly of the perfectly luminous single dharmadhātu.