大方廣佛華嚴經疏 1.16

1.16

八示真法者，欲成行位，須解法理，不體理事，行亦非真。故〈兜率偈〉云「不了真實法，諸佛故興世。」此亦二種：一顯事理無礙法、二顯事事無礙法，並如義分齊說。

Eighth, indicating the true Dharma: if one wishes to accomplish practices and stations, one must understand the principles of phenomena; if one does not embody noumenon and phenomena, practice will not be true. Hence the gāthā in the 'Tuṣita' chapter says: 'Because they do not understand the real Dharma, the Buddhas arise in the world.' This also has two kinds: first, revealing the Dharma of the non-obstruction between noumenon and phenomena; second, revealing the Dharma of the non-obstruction among phenomena. Both are as explained in the section on doctrinal tenets.