“Fire, in the ancient philosophy of all times and countries, including our own, has been regarded as a triple principle. As water comprises a visible fluid with invisible gases lurking within, and, behind all the spiritual principle of nature, which gives them their dynamic energy, so, in fire, they recognized: 1st. Visible flame; 2nd. Invisible, or astral fire – invisible when inert, but when active producing heat, light, chemical force, and electricity, the molecular powers; 3rd. Spirit.
They applied the same rule to each of the elements; and everything evolved from their combinations and correlations, man included, was held by them to be triune. Fire, in the opinion of the Rosicrucians, who were but the successors of the theurgists, was the source, not only of the material atoms, but also of the forces which energize them.
When a visible flame is extinguished it has disappeared, not only from the sight but also from the conception of the materialist, forever. But the Hermetic philosopher follows it through the “partition-world of the knowable, across and out on the other side into the unknowable”, as he traces the disembodied human spirit, “vital spark of heavenly flame”, into the AEthereum, beyond the grave.”
H. P. Blavatsky