大方廣圓覺修多羅了義經略疏 2.701

2.701

前總明觀行，一向稱理而修，猶可領解。今於一味之中廣張諸輪屈曲差別，差別不乖一味，尤為難見，故不思議。

Previously, the general explanation of contemplative practice was cultivated strictly in accord with the principle, which could still be grasped. Now, within the single taste, the intricate distinctions of the various wheels are extensively laid out, and that distinctions do not violate the single taste is especially difficult to see; hence it is 'inconceivable.'