Kundalini Yoga: Heart Cakra Symbology
Joseph Campbell discusses the symbolism of the heart cakra, the site of the birth of the spiritual as opposed to the physical life.
For more on the symbolism of the kundalini and of the cakras, see Mythos: The Shaping of Our Spiritual Tradition (jcforg.kinsta.cloud/works/mythos-series) and Myths of Light: Eastern Metaphors of the Eternal (jcforg.kinsta.cloud/works/titles/myths-of-light).