法華玄論 10.43

10.43

答：知能隨喜之心及所隨喜之福，無得無依、不能不所、非二非不二，如此歡喜心即是波若。又以波若心隨喜，故隨喜即是波若。

Answer: One knows that the mind capable of rejoicing in accord and the merit that is rejoiced in are without attainment and without reliance, neither subject nor object, neither dual nor non-dual. Such a joyful mind is itself prajñā. Furthermore, because one rejoices in accord with a mind of prajñā, rejoicing in accord is itself prajñā.