俱舍論疏 30.38

30.38

On the Śāstra's statement: "In principle it must be so [...] as explained extensively in the sūtra": Further citing the sūtra to show that because they were not suitable vessels for the Dharma, He did not teach them. If He had answered that it exists, He feared they would cling to a permanent self; if He had answered that it does not exist, He feared they would give rise to annihilationism; therefore the Buddha did not answer.