摩訶止觀 3.241

3.241

真諦無為，亦是於常，一相無變。若人分別真諦二相遷動者，不能發真；要須觀空，方入無漏。如須菩提觀空，憍陳如證無生智。又律儀不具足者，若能觀空得道共戒，此是具足戒也。

The unconditioned of the absolute truth is also eternal, of a single characteristic and unchanging. If a person discriminates two characteristics and movement in the absolute truth, they cannot manifest the absolute; they must contemplate emptiness before entering the undefiled. Just as Subhūti contemplated emptiness and Kauṇḍinya realized unproduced wisdom. Furthermore, regarding 'incomplete moral discipline': if one can contemplate emptiness and attain the precepts concurrent with the path, these are the complete precepts.