俱舍論疏 18.61

18.61

「論曰至立住定名」，此即說百劫修相報業時名為住定。住定有六：一定生善趣、二定生富貴家等、三定具根、四定為男身、五定憶宿命、六善無退屈。

The commentary states: "[...] establishes the name 'dwelling in certitude'." This means that when one cultivates the karmic retribution of the marks for one hundred kalpas, this is termed 'dwelling in certitude'. Dwelling in certitude has six aspects: first, definitely being born in a good destiny; second, definitely being born into a wealthy and noble household, etc.; third, definitely being endowed with complete sense-faculties; fourth, definitely possessing a male body; fifth, definitely remembering past lives; sixth, having wholesome qualities that never regress or weaken.