成唯識論演祕 5.83

5.83

答：如《燈》具辨。有義應前後起時差別故，謂若有時悅身不遍，但名為喜，乃時周遍說名為樂。

Answer: It is fully distinguished in the Deng. One opinion holds that it should be due to temporal differences in their arising: that is, when gratification of the body is not pervasive, it is merely called joy; when it is pervasive, it is called pleasure.