We think everything in our minds. Even when one talks about pure consciousness he is referring to one's own thoughts which are products of mind. Now consciousness is the changeless perception of these changing thoughts. When one talks about consciousness, the mind which is forming thoughts about consciousness, must necessarily be aware of consciousness in the first place right?
In other words, how is the mind able to form coherent thoughts and logic about something, if it's not aware of it? Does this imply that consciousness has causal powers over the mind, causing it to think whatever consciousness wants? But consciousness cannot want anything because it is a perception of "wanting" itself. So how is it even possible to talk/think about consciousness if the mind is like a mechanical bull driving the cart we call our body? The charioteer is the consciousness within us.
If mind thinks about consciousness, then what is really happening? Are we saying that our minds do whatever they like and our consciousness simply observes? But that would imply that we don't have free will, only the mind has free will. Even if we grant the mind free will, how does the mind form a thought about that which observes it? Isn't the mind an object of observation? So how can an object of observation think about the process of observation?