大乘百法明門論開宗義決 1.141

1.141

小乘論名通大地法者。地謂行處即是心王。是彼心所所行處故。大謂受等諸心所法通於三性心中行故。心王是此受想思等大家之地。名為大地。受等又是大地心家所有之法。名大地法。此法遍於三性心等。名通大地法。是持業釋也。故俱舍頌云。於一切心。

Regarding 'Designated as sarva-mahābhūmika-dharmas in Hīnayāna treatises': 'bhūmi' means sphere of activity, which is precisely the citta-rāja, because it is the sphere where those caittas act. 'Mahā' means that the various caittas such as feeling act universally within minds of the three natures. The citta-rāja is the grand home-ground of these [caittas] such as feeling, perception, and intention, and is called the 'mahābhūmi.' Feeling and so forth are in turn the dharmas belonging to the house of the mahābhūmi mind, and are called 'mahābhūmika-dharmas.' These dharmas pervade minds of the three natures and so forth, and are called 'sarva-mahābhūmika-dharmas.' This is a karmadhāraya compound. Thus the verse in the Abhidharmakośa says: 'In all minds.'