廣弘明集 8.44

8.44

仙異涅槃第五（仙明延期之術。不無其終涅槃常住之果。居然乖異）

5. Immortality Differs from Nirvāṇa (Immortality clarifies methods of extending one's span, but does not lack an ultimate end; the fruition of the eternal abiding of nirvāṇa is plainly different)