I had times where I just wasn't aware of what was going on in my mind.....until I was able to stop & focus using mindfulness to realize that there was in reality...a lot going on in my mind, I just wasn't aware of it.....doesn't mean that it's empty when our awareness just isn't there to know what it is that is going on or the thoughts that are actually happening....I would have sworn that my mind was empty too until I became more aware.