R-W-CH – ‘lightness, release of inner heat by expansion’

It is figuratively a movement toward expansion, toward dilation. Hieroglyphically, it is strength opposed to that of tenebre. And if the word [darkness] characterizes a compressive power, a compression, the word רוח will characterize an expansive power, an expansion. In both will be found this eternal system of two opposed forces, which the sages and savants of all the centuries…have seen in Nature, and signalized by different names…

…contains all the ideas of expansion and exaltation, of ethereal breath, inspiration, animation, etc… (The Hebraic Tongue Restored, Fabré d’Olivet, p.31)