觀無量壽佛經義疏 3.212

3.212

"‘When the flower opens, the Great Compassionate Avalokiteśvara Bodhisattva and Mahāsthāmaprāpta Bodhisattva emit great radiance, stand before the person, and expound the twelve divisions of scriptures for them.’" The twelve divisions of scriptures are the sūtras and teachings expounded by all Buddhas, comprising twelve categories across both the Mahāyāna and Hīnayāna; they are also called the twelvefold division of teachings: first, sūtra; second, geya; third, vyākaraṇa; fourth, gāthā; fifth, udāna; sixth, nidāna; seventh, avadāna; eighth, jātaka; ninth, itivṛttaka; tenth, vaipulya; eleventh, adbhutadharma; twelfth, upadeśa. "Division" means category. Third, hearing the Dharma and entering realization.