"What then do you call your soul? What idea have you of it? You cannot of yourselves, without revelation, admit the existence within you of anything but a power unknown to you of feeling and thinking"

Voltaire is asking us to think about the principle of the soul and what it indicates to us. He is recommending that without revelation, we can not truly comprehend the power of the soul and its presence within us. He is indicating that the soul is something that is beyond our understanding which it is a power that is unknown to us. He is recommending that the soul is something that is beyond our physical senses and that it is something that we can just comprehend through discovery. He is asking us to think about the power of the soul and its existence within us and to think about what it suggests to us. He is recommending that the soul is something that is beyond our comprehension and that it is something that we can only comprehend through revelation.