瑜伽論記 17.425

17.425

基云：定下劣性為此喜隨不巧便慧，第二禪有今無故言除定下劣性，初二禪中有此喜，不可言除下劣。然分分亦得除下劣性。

Ji says: The inferior nature of concentration is that this joy is accompanied by unskillful wisdom; it is present in the second dhyāna but absent here, hence it is said to remove the inferior nature of concentration. In the first and second dhyānas this joy is present, so one cannot speak of removing the inferior nature; however, portion by portion, one can also remove the inferior nature.