成唯識論了義燈 2.146

2.146

答：人天同異生，不障可不染，對聖名異生，不得故名染。又解：雖不障人夫，感生故名染，所知不障小，不招生不染。又解：定姓二乘亦依二障，立異生性，文無簡故。能障於大，必不得故，如無姓障，必不得聖依二立故。

Answer: Humans and devas are equally ordinary persons; not obstructing [them] could be undefiled, but in contrast to the noble, they are called ordinary persons, and because they cannot attain [nobility], they are called defiled. Another explanation: although they do not obstruct human [rebirth], they induce rebirth and are therefore called defiled; [the obstruction to] knowables does not obstruct the small [vehicle] and does not invite rebirth, so it is undefiled. Another explanation: for those determinate in the two vehicles, the ordinary nature is also established based on both obstructions, because the text makes no restriction. Being capable of obstructing the Mahāyāna, they must certainly fail to attain it, just as the obstructions of those lacking lineage must certainly prevent attaining nobility and are thus established based on both.