瑜伽論記 2.60

2.60

Regarding 'the second dhyāna experiences joy and pleasure born of concentration': 'concentration' refers to the one who has transformed the basis having the mind abide on a single object, namely the concentration obtained previously; 'born' refers to being produced from concentration; 'joy' is as before; it is not like the first dhyāna where one newly attains detachment for the very first time, hence it is called 'born of concentration'; prior to the first dhyāna there is not yet concentration, so it is only called 'born of detachment' and not 'born of concentration.'