The spirit in you that causes you to live is a being. Yes! a BEING. For one to be a being, one must have intelligence. The verse above proves that the spirit in you has intelligence. How? Well, as the verse say, your own spirit knows your thought, for one to know, one must have an intelligence right? And, for one to be considered as a being, one must have intelligence.
And so, I rest my case that apart from you as a being, there is a being in you that knows your thought more than you know it yourself.
A human indeed is in duality, a one-person in two beings.
(1) Yourself and the (2) Spirit in you that cause you to live and knows your thought more that you know it yourself. It seems not dual though because the second being in you is impersonal towards you meaning, the spirit let you be or does not intervene in your decision making so that, you alone are responsible to your own choices- this is the gift of free will.