成唯識論述記 5.991

5.991

述曰：此亦同前引六十三文證「三性俱」。定中通喜、樂受，率爾耳識但捨受故。

The Commentary states: This also, like the previous citation of the text of chapter sixty-three, proves the 'simultaneity of the three natures.' In meditative absorption there is an association with joy and pleasure feelings, whereas the instantaneous ear consciousness has only equanimity feeling.