大乘起信論裂網疏 6.37

6.37

This next eliminates the contemplating mind. The previous statement that one does not rely on breath up to seeing, hearing, perceiving, or knowing means that all discriminative thoughts are eliminated. However, so-called not relying on breath and so forth simply means thoroughly understanding that breath up to seeing, hearing, perceiving, and knowing are originally ungraspable, eliminating these discriminative thoughts of breath up to perceiving and knowing; it does not mean that there really is breath up to perceiving and knowing and that one intentionally dispels them. If one has the thought of dispelling, that is failing to understand that all dharmas are originally empty, and one will either fall into the non-conceptual concentration of external paths or the concentration of cessation of the two vehicles, which is not Mahāyāna śamatha contemplation; thus it says 'the thought of eliminating is also discarded'.