"Air is a subtle element, diaphanous, light and invisible, the tie between superior and inferior things, the domicile of the Meteors. There is nothing in the world that can omit this element. All creatures take from it their life and sustenance. Nothing would be born if air didn't attract and penetrate the multiplying nourishment, air contains a congealed spirit, better than all of the habitable earth; this element is more pure than water and less pure than Heaven; it participates in the purity of the superior element and the impurity of the inferior ones, and it is richly endowed by the Spirit of the Universe". (The Cosmopolite, Philosophical Letter)

"Its father is the Sun, its mother is the Moon. The wind carried it in its womb, the earth breast fed it. It is the father of all, the Telesma of all in the world. Its strength and its power is complete, if cast to earth." ( The Emerald Tablet of Hermes)

" Hue is the most convenient name for this vagabond spirit, always irritated and dissatisfied, who perpetually searches for a place to embody in it. The adept in the chemical art is the only one with the power to help him, for this reason he is the most valuable of the men. To bake the air in order to make grow a metallic tree, what madness to the people's view!" (E. d'Hooghvorst, Penelope's Thread I )