In the first place one asks, "What is the heart? Where is the heart?" One is accustomed to saying that the heart is in the breast. Yes, that is true. There is a nerve center in the breast of everyone which has so much to do with the feelings that the heart is always pictured in the breast, that center which is most sensitive to our feelings. When a person is feeling great joy, in that center one feels something light up, and by the lighting up of that center the whole person seems light. The person feels as if he or she flew, there is a great joy in his or her life. Likewise, if depression or despair comes into one's life, this has an effect upon the center. One feels one's throat choked and one's breath is heavy with a load; again it is that center that feels.