SDhPS, 2, 2.2 gambhīraṃ śāriputra durdṛśaṃ duranubodhaṃ buddhajñānaṃ tathāgatairarhadbhiḥ samyaksaṃbuddhaiḥ pratibuddham /

SDhPS, 11, 213.2 idaṃ sūtraṃ gambhīraṃ sūkṣmaṃ durdṛśaṃ na cānena sūtreṇa kiṃcidanyat sūtraṃ samamasti //