瑜伽師地論略纂 12.127

12.127

論云「進道勝行」故。此進道勝行作有相行，緣事相有差別，故名世間。非煩惱業之所纏繞故，故名不共，以體是無漏故；以有相故，亦名為共。有情所不能行無漏，故名不共；作緣事相故，名共世間。作後地前方便修，為後地之進道，故名進道勝行。

Because the treatise says 'the superior practice of advancing on the path.' This superior practice of advancing on the path engages in practices with signs and takes differentiated phenomenal signs as its object; hence it is called worldly. Because it is not entangled by afflictions and karma, it is therefore called unshared, since its substance is uncontaminated; because it has signs, it is also called shared. Because ordinary sentient beings are unable to practice what is uncontaminated, it is called unshared; because it takes phenomenal signs as its object, it is called shared with the worldly. As it acts as the preparatory cultivation of expedients for the subsequent bhūmi, serving as the advance on the path for the subsequent bhūmi, it is called the superior practice of advancing on the path.