'Now where the sight has entered into the void (the open space, the black pupil of the eye), there is the person of the eye, the eye itself is the instrument of seeing. He who knows, let me smell this, he is the Self, the nose is the instrument of smelling. He who knows, let me say this, he is the Self, the tongue is the instrument of saying. He who knows, let me hear this, he is the Self, the ear is the instrument of hearing.

In plain words: The eye, nose, tongue and ear are only tools for seeing, smelling, speaking and hearing. The Self is the one who knows and wants to see, smell, speak or hear.