《黄帝内经·灵枢·禁服》
既然说九针的道理，大到不能再大，细到不可再细，它的巨细、高深已经到了无法度量的境地，如此博大精深的内容，如何归纳总结起来呢？
夫大则无外，小则无内，大小无极，高下无度，束之奈何？
Since the principles of the nine needles are so vast that they cannot be greater, and so fine that they cannot be finer, and their depth and complexity are immeasurable, how can such profound content be summarized?