成唯識論述記 6.448

6.448

述曰：不然，輕安唯在上界定地中有，所以者何？由定滋潤所長養故，有調暢故。欲界斂心決非實定，故無滋潤名調暢也。何以得知？六十三等說欲界諸心、心所闕輕安，故名不定地。不爾，應言闕上界輕安，故名不定地。若爾，如何說通一切地？

The Commentary states: This is not so; pliancy exists only within the meditative stages of the higher realms. Why is this? Because it is nourished and cultivated by samādhi, so that there is harmonization and fluency. Concentrating the mind in the desire realm is definitely not genuine samādhi, so it lacks the nourishment termed harmonization and fluency. How is this known? Fascicle 63 and others state that the minds and mental factors of the desire realm lack pliancy, and are therefore called non-meditative stages. If it were not so, it should say they lack the pliancy of the higher realms and are therefore called non-meditative stages. If that is the case, how can it be said to be pervasive of all stages?