瑜伽論記 23.242

23.242

又解：若增減者，偏說外五塵現著，故云若增，外塵微劣，故云若減；若取捨者，偏約內根，以外境增故能取，外境減故能捨也。

Another explanation: As for 'increase or decrease', this specifically refers to the external five sense-objects manifesting prominently, hence called 'increase', and the external sense-objects being subtle and weak, hence called 'decrease'. As for 'taking or abandoning', this specifically refers to the internal sense-bases: because the external objects increase, one is able to take them, and because the external objects decrease, one is able to abandon them.