大方廣圓覺修多羅了義經略疏 2.1127

2.1127

常心也。我入覺時我即圓覺，眾生亦爾，何有取者？故天親云：「自身滅度，無異眾生，故名常心。」若見有眾生因我入覺，即非常也。

This is the constant mind. When I enter enlightenment, I am myself perfect enlightenment; sentient beings are also like this—how could there be a grasper? Hence Vasubandhu says: 'One's own extinction is not different from that of sentient beings; hence it is called the constant mind.' If one sees that there are sentient beings who enter enlightenment on account of oneself, it is not constant.