大方廣佛華嚴經疏 13.4

13.4

三徵釋中，徵上難思言也。下釋云「能感之機差別無邊，如來普應周于法界」，廣難思也。下結文具顯。又隨宜說法，意趣難思。又等法界者，舉一說法，等餘多門，門不可盡；量等法界，法門難思。

Three, in querying and explaining, it queries the word 'inconceivable' above. Below, the explanation says, 'The capacities able to evoke [a response] are boundlessly distinct, and the Tathāgata's universal response pervades the dharmadhātu'—broadly inconceivable. The concluding text below fully reveals this. Furthermore, preaching the Dharma according to what is suitable, the import is inconceivable. Again, 'equaling the dharmadhātu': adducing a single preaching of Dharma equals the remaining multiple gates, and the gates cannot be exhausted; their measure equals the dharmadhātu, so the Dharma gates are inconceivable.