瑜伽論記 4.67

4.67

An objection asks: the fourth [dhyāna] has the feeling of equanimity, and the feeling of equanimity is called the pleasure of equanimity; the four formless absorptions also have the feeling of equanimity, so they should also be called the pleasure of equanimity. Therefore, it is now explained: those only have mental pleasure, whereas this has pleasure of both body and mind; hence only this is called 'dwelling happily', not the four formless absorptions.