維摩經玄疏 1.71

1.71

二、隨便宜者，即是為人。《論》云「於一事中，或聽、不聽」，宜即是聽，不宜者即不聽也。如金師宜數息觀，浣衣宜不淨觀，即是便宜。若說四門若事、理，便宜生善，是名為聽；若生不善，則是不聽，是名為人悉檀也。

2. Accommodating suitability: this is [the siddhānta] for the person. The Treatise states, 'In a single matter, [the Buddha] may permit it or not permit it.' What is suitable is permitted; what is unsuitable is not permitted. For example, for a goldsmith the contemplation of breath-counting is suitable, and for a washerman the contemplation of impurity is suitable; this is suitability. If one expounds the four gates, whether phenomena or principle, and suitability generates goodness, this is called being permitted; if it generates unwholesomeness, it is not permitted. This is called the siddhānta for the person.