You say that an emotion is the mind’s reflection in the body. But sometimes there is a conflict between the two : the mind says “no” while the emotion says “yes”, or the other way around.
If you really want to know your mind, the body will always give you a truthful reflection, so look at the emotion or rather feel it in your body. If there is an apparent conflict between them, the thought will be the lie, the emotion will be the truth. Not the ultimate truth of who you are, but the relative truth of your state of mind at that time.
Conflict between surface thoughts and unconscious mental processes is certainly common. You may not yet be able to bring your unconscious mind activity into awareness as thoughts, but it will always be reflected in the body as an emotion, and of this you can become aware. To watch an emotion in this way is basically the same as listening to or watching a thought, which I described earlier. The only difference is that, while a thought is in your head, and emotion has a strong physical component and so is primarily felt in the body. You can then allow the emotion to be there without being controlled by it. You no longer are the emotion; you are the watcher, the observing presence. If you practice this, all that is unconscious in you will be brought into the light of the consciousness.
So observing our emotions is as important as observing our thoughts?
Yes. Make it a habit to ask yourself : What’s going on inside me at this moment? That question will point you in the right direction. But don’t analyse, just watch. Focus your attention within. Feel the energy of the emotion. If there is no emotion present, take your attention more deeply into the inner energy field of your body. It is the doorway into Being.
Reference : The Power of Now. Eckhart Tolle.