華嚴經義海百門 1.37

1.37

三、明難思者，謂塵不壞小量而遍十方，普攝一切於中顯現，斯由量即非量、非量即量。又居見聞之地，即見聞之不及；處思議之際，即思議之不測。皆由不思議體自不可得，故即思不可思，經云「所思不可思，是名為難思。」

Third, explaining the inconceivable: this means that the dust mote does not destroy its small measure yet pervades the ten directions, universally gathering all things to manifest within it; this is because measure is non-measure, and non-measure is measure. Furthermore, residing in the realm of seeing and hearing, it is beyond the reach of seeing and hearing; dwelling at the limit of thought and deliberation, it cannot be fathomed by thought and deliberation. All this is because the inconceivable essence is itself unobtainable; therefore, that which is thought cannot be thought. The sūtra says: "That which is thought cannot be thought; / this is called inconceivable."