大乘起信論略述 2.188

2.188

論。亦不得隨心至以心除心　述曰。次下第三除失念心。於中有二。初舉非想制。後示除方便。此初也。不得隨心外念境者。此令不起外失念相。謂修止者常須作意。豈唯離於倒境。倒心亦不住心失念外境。後以心除心者。此令不起內失念相。前心失念。念著境時既捨於境。後心失念。念著內心。即以止心除心也。

[Treatise:] Nor can one follow the mind ... using the mind to eliminate the mind. [Exposition:] Next is the third [part], eliminating the mind of lost mindfulness. Here there are two parts: first, citing non-conceptualization to restrain; later, showing the expedient of elimination. This is the first. "One must not follow the mind in externally minding objects": this directs one not to give rise to external marks of lost mindfulness. That is, one who cultivates calm must constantly apply attention; how could one merely depart from inverted objects? The inverted mind also does not abide in the mind losing mindfulness toward external objects. "Later using the mind to eliminate the mind": this directs one not to give rise to internal marks of lost mindfulness. When the preceding mind loses mindfulness and clings to objects, one relinquishes the objects; when the subsequent mind loses mindfulness and clings to the internal mind, one uses the mind of calm to eliminate that mind.