Some are in physical form, but most are not. Love is the water of this sea. Love is an energy, the highest and most pure energy. At its highest vibrations love possesses both wisdom and awareness. It is the energy that unites all beings.
Love is an absolute and it never ends.
Healing energy is a component of spiritual energy. With future research and improved technology, we will better understand this connection. When physicians talk about the mind-body connection, I believe love is the connecting energy. When religions talk about the nature of God, love is always mentioned. This is true for all religions and unites all of us.