瑜伽論記 3.243

3.243

二十三、二受俱行中，唯識云：十樂捨俱，受不與受俱故，老死位中多分無樂及客捨故，十一苦俱，非受俱故，老死多苦，故說十一，其種子體當位俱，如有支等，種與種俱，皆如理思，俱謂俱有。

Regarding 'Twenty-third, co-occurrence with the two feelings,' the Vijñaptimātratāsiddhi says: Ten co-occur with pleasant and neutral [feelings], because feeling does not co-occur with feeling, and in the state of aging-and-death there is for the most part no pleasure or adventitious equanimity. Eleven co-occur with unpleasant [feeling], because it does not co-occur with feeling, and aging-and-death has much suffering; hence it states eleven. Their seed substances co-occur in their respective states, like the existence branch and so on; seeds co-occurring with seeds should all be reflected upon properly. 'Co-occurring' means co-existent.