成唯識論述記 8.544

8.544

述曰：十六、四緣門，十二支相望，增上緣定有，以寬故。餘之三緣有無不定，以局故。問：若亦有餘，何故《緣起》下云：唯有一增上。

The Commentary states: Sixteenth is the section on the four conditions. With regard to one another, the twelve links definitely have the condition of predominance, because it is broad. The presence or absence of the remaining three conditions is indeterminate, because they are narrow. Question: If there are also the others, why does the Pratītyasamutpāda[-sūtra] say below: 'There is only one, predominance'?