大般涅槃經集解 56.94

56.94

案僧亮曰：答第三難。正因無初，無初故常也。發心是緣因，非正因也。僧宗曰：兼答第七門也。寶亮曰：發心非正因佛性也。佛性是常，心是無常，是故善心有時而有、有時而無，唯正因性用常而不改。

Sengliang states: This answers the third objection. The direct cause has no beginning, and because it has no beginning, it is permanent. The resolve is a contributory cause, not the direct cause. Sengzong states: It also answers the seventh section. Baoliang states: Generating the resolve is not the direct-cause buddhadhātu. The buddhadhātu is permanent and the mind is impermanent; therefore the wholesome mind is present at times and absent at times, whereas only the function of the direct-cause nature is permanent and unaltering.