般若波羅蜜多心經幽贊 1.20

1.20

今言行者，雖行而不見行，非無行義，由此經說不見行、不見不行，假有所行，實無行故，不爾，唯應說不見行；復言不見不行，有何詮理？是故定應如後所說。

Now, speaking of 'coursing': although one courses, one does not perceive coursing; it does not mean there is no coursing. Therefore, this sūtra says: 'One does not perceive coursing; one does not perceive non-coursing,' because provisionally there is coursing, while in reality there is no coursing. Were it not so, it should only say 'one does not perceive coursing'; what principle would be expressed by further saying 'one does not perceive non-coursing'? Therefore, it must definitely be as explained later.