大般涅槃經集解 56.78

56.78

案僧亮曰：更以七難明佛無性，而成顯佛性非無，成上不失壞之義。初以天人證佛性無成也。寶亮曰：第五翻，觀因中立性也。雖難有七，然多執緣，難使無正因也。此第一難云：若因中本無者，則無正因唯有緣因，故得佛耳。

Sengliang comments: He further uses seven objections to argue that the Buddha has no nature, thereby establishing and revealing that the buddhadhātu is not non-existent, establishing the above meaning of being indestructible. First, he uses devas and humans to prove that the buddhadhātu has no accomplishment. Baoliang comments: The fifth turn: examining the positing of nature within the cause. Although there are seven objections, they mostly cling to conditions, arguing so as to eliminate the direct cause. This first objection states: if it originally does not exist in the cause, then there is no direct cause, but only contributory causes, through which one attains Buddhahood.