首楞嚴義疏注經 4.234

4.234

境界微妙，心言叵測。凡夫著事、偏小滯空，俱所知心，莫及斯境。故《圓覺經》云「但諸聲聞所圓境界，身心語言皆悉斷滅，終不能至彼之親證所現涅槃，何況能以有思惟心測度如來圓覺境界，如取螢火燒須彌山，終不能著，以輪迴心生輪迴見，入於如來大寂滅海，終不能至。」

The realm is subtle and wondrous, unfathomable by mind or speech. Ordinary beings cling to phenomena; partial, lesser practitioners stagnate in emptiness; both are of the mind of known objects, unable to reach this realm. Thus the Perfect Enlightenment Sūtra states: 'Even the realm perfected by all the śrāvakas, in which body, mind, and language are all entirely cut off, can never reach the nirvāṇa manifested through their own personal realization; how much less could one use a conceptualizing mind to gauge the Tathāgata's realm of perfect enlightenment? It is like taking a firefly's light to burn Mount Sumeru—it can never ignite it. Entering the Tathāgata's great sea of tranquil extinction with a mind of cyclic existence producing views of cyclic existence, one can never reach it.'