瑜伽論記 11.179

11.179

泰云：言謂即四行止道前行者，四止道前方便思量觀察故名四觀也，從四觀後任運而轉不作意思量即名四止。

Tai says: 'The phrase "namely, the precursor to the path of calm abiding of the four practices": prior to the path of the four calm abidings, one deliberates and contemplates as an expedient, hence they are called four insights; subsequent to the four insights, operating spontaneously without intentional deliberation is precisely called the four calm abidings.'