from William Bloom-

"In moments of powerful beauty,
Emotions move that can melt even the thickest and most cynical of skins.
Endorphins flow. There is a release of tension.
Energies, internal and external, flow and connect.
The experience is not only soft and calm,
But it also contains the power and creativity of Nature and the Universe!
To create and work consciously with these moments of connection
Is to exercise what we might call our spiritual muscles
And our spiritual intelligence.
What do I mean by spiritual?
I simply mean that whole reality and dimension
Which is bigger, more creative, more loving, more powerful, more visionary,
More wise, more mysterious-
Than materialistic daily human existence."

There is no theology or belief system that relates to this meaning of spiritual.

The Endorphin Effect, 2001