首楞嚴義疏注經 9.213

9.213

於三昧中精究研窮，妙明元體無色陰相。由斯研究，深觀此理，故得四大不相交織，須臾之際身能出障，猶行虛空。斯則心不主形，四大亡質，觀心無礙，流溢前塵，功用暫然，非是聖證。苟知此是禪者功力則無有失，故云善境。若總撥為魔，則抑善功用。若言即聖，又未斷惑，故令善識而無取捨。下皆倣此。

In samādhi, one finely inquires and investigates: the original substance of wondrous brightness has no marks of the aggregate of form. Due to this investigation, deeply contemplating this principle, one attains the state where the four great elements do not interweave with one another, and in an instant the body can pass out of obstacles, just like walking through empty space. This is when the mind does not take the form as primary, the four great elements lose their material resistance, the contemplating mind is unimpeded, overflowing into the dusts before it; this effort is only temporary and is not a holy realization. If one knows that this is the power of the meditator's effort, there will be no error, hence it is called a good state. If one dismisses it entirely as māra, one suppresses wholesome effort. If one says it is holy, one has not yet severed delusions; hence [the Buddha] causes one to understand it well without grasping or rejecting. The following are all modeled on this.