US-P15.017ab ।US-P15.017cd ॥
In plain words
Because it witnesses every cognition that arises, the seer never changes, and it is everywhere at once. If the seer did change, it would be like the intellect and the senses — knowing only a little, one thing at a time.
Close to the Sanskrit
Because of being the witness of all cognitions, [the seer is] changeless and all-pervading. If the seer were to undergo modification, he would become a knower of little, like the intellect and the rest.