瑜伽論記 1.228

1.228

文云：不共境者，不共五識故。何故蘊中唯三不言識蘊者？此有三解：一解：自性門攝故除也。又解：五識自證、證自證分，亦緣識蘊，故共緣中攝。又解：六內處中，既有意處故除也。

The text states: 'unshared objects' means unshared with the five consciousnesses. Why is it that among the aggregates there are only three, and the aggregate of consciousness is not mentioned? For this there are three explanations. One explanation: It is subsumed under the gate of intrinsic nature, hence it is excluded. Another explanation: The self-witnessing and self-witnessing-of-the-self-witnessing aspects of the five consciousnesses also take the aggregate of consciousness as an object, hence it is subsumed under shared objects. Another explanation: Among the six internal bases, since there is already the mental base, it is therefore excluded.