“I am in everyone’s heart as the Supersoul.” 

–Bhagavad-Gita, As it is, trans. A.C. Bhaktivedanta Swami Prabhupada

“Make purses for yourselves that do not wear out, an unfailing treasure in heaven, where no thief comes near and no moth destroys. For where your treasure is, there your heart will be also.” –Jesus, Luke 12:33-34, The Holy Bible King James Version

“This person (puruṣa) here in the heart is made of mind, is of the nature of light, is like a little grain of rice, is a grain of barley. This very one is ruler of everything, is lord of everything, governs this whole universe, whatsoever there is.” 

–Brhadaranyaka Upanishad 5.6.1, The Thirteen Principal Upanishads trans. Robert Ernest Hume 

The Upanishads, ancient Sanskrit texts considered the core of Hinduism, mention the importance of the heart repeatedly. In the Bhagavad-Gita, Krishna says he is in the hearts of all men and women. Jesus placed the treasure that cannot be destroyed within the heart. Science today is discovering the high level of intelligence and the powerful electromagnetic field of the heart. 

Physiologically speaking, the heart is a big deal. It’s important, obviously: its beating is what keeps us alive. Spiritually speaking, the heart is also a very big deal, because ultimately the physical and the spiritual are one and the same. The location of the source of life in the human body is the location of our ultimate Source.