摩訶止觀 5.115

5.115

心滅尚不能生一法，云何能生三千法耶？若從心亦滅亦不滅生三千法者，亦滅亦不滅其性相違；猶如水火二俱不立，云何能生三千法耶？若謂心非滅非不滅生三千法者，非滅非不滅非能、非所，云何能、所生三千法耶？亦縱亦橫求三千法不可得，非縱非橫求三千法亦不可得。言語道斷，心行處滅，故名「不可思議境」。

When the mind ceases, it cannot even produce a single phenomenon; how could it produce the three thousand phenomena? If the three thousand phenomena were produced from a mind that is both ceased and unceased, being both ceased and unceased are mutually contradictory in nature; just as water and fire cannot both stand together, how could it produce the three thousand phenomena? If one says the three thousand phenomena are produced from a mind that is neither ceased nor unceased, being neither ceased nor unceased is neither agent nor object; how could there be agent and object producing the three thousand phenomena? When sought either temporally or spatially, the three thousand phenomena cannot be found; and when sought neither temporally nor spatially, the three thousand phenomena also cannot be found. The path of words is cut off, and the place of mental activity is extinguished; hence it is called the "inconceivable realm."