Mere emotions, more like irrationality, tends to be of the mind. The mind can cause reactions, but with a good heart, one can act properly and do the right thing. And I don't mean crying. I mean irrational anger, things of that nature, which can be deadly if not controlled.
It is arguable that logic comes from the heart and that fickle emotions come from the mind. I think you'll find that in literature, it is often cool, unemotional, intellectual reason and logic from the mind, and passionate, emotional, instinctive actions from the heart. I suppose both ways can be used, but the heart is passionate (passionate love) whereas the mind is generally thought of as reasonable.