Druid Revival lore contains a system of its own, a set of three elements that first appears in Iolo Morganwg's writings. Whether it's an invention of Iolo's or a surviving scrap of some older teaching is anyone's guess, but the three elements have been part of Druid Revival teaching ever since his time. Their names are nwyfre, gwyar, and calas.
Nwyfre (pronounced "NOOiv-ruh") is an old Welsh term meaning "sky" or "heaven." As an element, nwyfre is the source of life and consciousness, and modern Druids often refer to it simply as the life force. Its image in nature is blue sky.
Gwyar (pronounced "GOO-yar") literally means "blood" in old Welsh, but its more general meaning is "flow" or "fluidity." As an element, gwyar is the source of change, motion, growth, and decay. Its image in nature is running water.
Calas (pronounced "CAH-lass") comes from the same root as caled, Welsh for "hard," and means "solidity." As an element, calas is the source of form, differentiation, manifestation, and stability. Its image in nature is stone.
According to Druid philosophy, everything in the universe is made up of these three elements in some combination, with one element dominant. All are forms of primal substance, which is called manred. Manred has no characteristics of its own, except for the power to condense into calas, flow into gwyar or expand into nwyfre.
Manred is not fixed, but changing continuously.
As an ancient Gaelic saying tells us:
“With the ebb, With the flow,
As it shall be, With the ebb, With the flow.”