俱舍論記 26.22

26.22

「根謂信解至勝位者心」者，既不能知上根、上位，義准能知自根、下根，自位、下位。

"'Faculty' refers to liberation through faith […] the minds of those in superior states": since one cannot know superior faculties and superior states, it follows by implication that one can know one's own faculties and lower faculties, and one's own state and lower states.