The Atman or Soul is closer to our heart than our head
Our mind is a wonderful instrument. With it we can analyze, invent, solve and do a lot of things. But the mind is only capable of intellectualizing. The head is capable of performing a lot of useful functions. We can think, solve, create and analyze with our heads. With our heads we process thoughts. In other words our minds are nothing more than thought processing mechanisms. It will not be an exaggeration to say that in some day in the future man will be able to mimic the thought processing capability of the mind.
On the other hand, the heart is the seat of far more subtler emotions like love, compassion, tolerance etc. These are unique and can never be imitated by machines. It is the seat of nobler emotions than the mind. The heart is generally considered as the seat of these emotions. However the heart is just another organ. Can it be the place where these emotions generate?
In my opinion emotions like love, kindness or tolerance emanate somewhere from the chest. The psycho-physiological activities behind these emotions must be far more complex but it is centered in the middle of the chest where the heart lies. Our conscience is also generally assumed to be centered on our heart.
Devotion, faith or bhakti also can also only emanate from this heart region. Faith or bhakti cannot come from the mind through reading of scriptures or philosophy. We cannot intellectualize the concept of the Supreme.
A good life is full of love, compassion, kindness and devotion to a Supreme Being. Hence it is clear that the seat of human goodness in general comes from the heart.
Also central to several faiths of this world is the concept of a Personal Soul or the Atman. Since the Atman or the Soul can only be centered on human goodness it becomes obvious that the Soul and the Atman are closer to the heart than to the head.