瑜伽論記 18.436

18.436

泰云：詮念念生滅事名無常教，詮無始常相續事名無始教。有釋說：有為法名無常教，說無為法名無始教。

Tai says: Explaining things that arise and cease thought-moment by thought-moment is called the teaching on impermanence; explaining things that are in beginningless, constant continuum is called the teaching on beginninglessness. Another explanation says: Expounding conditioned dharmas is called the teaching on impermanence; expounding unconditioned dharmas is called the teaching on beginninglessness.