維摩經玄疏 1.154

1.154

二者、外人見心明不可說相者，如長爪梵志云「一切語可轉，一切論可破，一切執可除，是諸法實相？何等是性？何等是相？于久思惟，不得一法可以入心」，是不可說也。若類分別一切外人絕言之理，可約此義辨同異也。

Second is the mark of the ineffable clarified from the non-Buddhist view of the mind: just as the Long-Nail Wanderer said, 'All statements can be overturned, all treatises can be refuted, and all attachments can be eliminated. Is this the true mark of all dharmas? What is nature? What is mark? Thinking for a long time, I have not found a single dharma that can be taken into mind'—this is ineffable. If one classifies and distinguishes the principles beyond words of all non-Buddhists, one can determine similarities and differences in reference to this meaning.