大方廣佛華嚴經疏 48.15

48.15

第十三手有十三相，分三：初九直語手相。右五左四者，或左脫一，或表右常用故。而前肩則右二左三，相通正等。右中六十六云成變化網者，光化為網也。左中七十二云因陀羅網為嚴者，即是網鞔之相，互涉入故。次二左右指可知。後二左右掌皆有千輪者，輪轂輻輞三事具足，自然成就不待人功。

Thirteenth, the hands have thirteen marks, divided into three: the first nine directly describe marks of the hands. That there are five on the right and four on the left is either because one is missing on the left, or to symbolize that the right is used frequently. Yet for the shoulders above, there were two on the right and three on the left, so overall the marks are exactly equal. In the right, number sixty-six says "forming a net of transformations": the light transforms into a net. In the left, number seventy-two says "adorned with Indra's net": this is the mark of webbed fingers, because they mutually interpenetrate. The next two are the left and right fingers, which are self-evident. The last two, both left and right palms possessing thousand-[spoked] wheels: the three components of wheel hub, spokes, and rim are fully complete, naturally accomplished without awaiting human effort.