俱舍論疏 6.153

6.153

論「又非能作至時無限故」，釋三因無隨因勢力分限，由一取果已窮生死際數與果故。

The treatise says: "Furthermore, not for efficient causes [...] because the time is unlimited." This explains that the three causes [efficient, homogeneous, and universal] lack a limitation according to the force of the cause, because once they have appropriated the fruit, they repeatedly yield fruits all the way to the limit of saṃsāra.