首楞嚴義疏注經 5.90

5.90

巾喻真性，結喻六根，逐綰而問，相由妄別，令知根本是一，妄結生六，無同異中熾然成異，故一一綰皆名為結。

The cloth symbolizes the true nature; the knots symbolize the six faculties. Asking about each tie in turn, their characteristics are distinguished through delusion, so that one may know that the source is one, while false knots give rise to six, and within what has neither sameness nor difference, difference blazes forth; hence each tie is called a knot.