US-P18.067ab ।US-P18.067cd ॥
In plain words
Just as people identify the Self with the body through the 'I' notion and say 'it knows', so too they attribute the agency of knowing to both the intellect and the Self.
Close to the Sanskrit
Just as the 'I' notion is in the body, and worldly people say 'knows', thus agency of knowing is attributed similarly to the intellect and the Self.