What I mean by this is that there are metaphysical/spiritual *substances* created through Heart and Spirit that are qualitatively experienced and shared: Lovingkindness, joy, peace, patience, faith, for example. These are not mental concepts, but metaphysical substances.

The Heart, in my learning, is referred to as an "organ of spiritual perception." Just as the eyes detect a band of waves on the visible light spectrum, and ears audible sound waves, so too does the Heart attune to the Spirit of other bodies.