In physics a physical wave is defined as a regular disturbance in a medium, the net result being a transfer of energy.
Electromagnetic waves, however, may travel through either a medium or a vacuum.¹
This perspective seems lacking because it excludes a whole realm of grace and spirit that many say exists beyond but also within the world of matter and energy. That is, spirit is immanent within matter/energy. This is very different from saying that spirit is the same thing as matter/energy.
Perhaps those who have not experienced the numinous quality of spirit will continue to suppose that matter/energy is equivalent to spirit, or, worse, reduce all things spiritual to vulgar materialistic or psychoanalytic theories.
In Christian theology, God’s grace is immanent but qualitatively different from experiences originating from the natural world of matter/energy. So spiritual experience is totally different from, say, the aesthetic appreciation of a sunset or an endorphin rush from jogging.
Again, this distinction eludes some people. And to complicate things, many depth psychologists, mystics and poets say there are a variety of spiritual experiences—and each is qualitatively different from the realm of matter/energy.
¹ As we currently define a vacuum, that is. Most would say that an absolute vacuum is “empty,” but we could argue that spirit, being qualitatively different from matter/energy, might exist in a vacuum.
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