Understanding the human heart is a very important subject. It is where empathy, intuition, compassion, and love express from. Meditation on the heart is extremely beneficial for those seeking to develop a deeper understanding and connection with life. Emotional energy such as Love energy can be harnessed and be used to heal the body. The most powerful kind of love is unconditional love. Such love allows immense amount of energy to flow through the body freely and uninhibited, as no boundaries are present in unconditional love. This allows a powerful connection to the surrounding fields of energy. Human emotions and thoughts have been proven to effect quantum fields in surrounding environment. Observe the "Double Slit Experiment"
On a further note:
Forgiveness and acceptance are found to be key components to developing a unconditional state of love, such acts release emotional blocks and end negative emotional and mental cycles, freeing a vast amount of energy and allowing the life force to flow naturally once again. The heart has been expressed to be the human bodies zero point energy field, it is known in Chinese philosophy to be the seat of the soul, and it is also the second organ created during the birthing process, the skin being the first.