US-P18.120ab ।US-P18.120cd ॥
In plain words
Whatever is flooded through with the Self's reflection is what gets called "the knower." Take these three apart, right here, and whoever knows them knows the Self.
Close to the Sanskrit
That which is wholly pervaded by the reflection of which (the Self) is declared to be 'the knower'; whoever, having discriminated this triad here, knows — he is a knower of the Self.