瑜伽師地論略纂 2.18

2.18

The faculties are undamaged due to two causes: first, because they are not destroyed, they are not completely absent; second, because they are not emaciated and weak, they are not deficient and feeble. The explanation in fascicle 54 of destruction, emaciation, and the alteration of the faculties due to four conditions is the reverse of these two meanings here. This refers to the physical faculties. As for the mental faculty being undamaged, it is the reverse of that text's explanation of the mental faculty being damaged due to four conditions. That mental faculty is the sixth [consciousness], unlike the five faculties. That it does not speak of the seventh and eighth faculties being undamaged can be known by inference.