It is enough for me to have proved my supposition through the astonishing rapidity of ethereal matter, and through the resistance it meets in the plenum that forces its parts moving in every direction to place themselves in vortexes, and to have confirmed my proofs by the most general effects of physics such as the transmission of light and colors, the production of fire and its effects, the weight of bodies, their hardness and fluidity, on which depend all natural effects, and whose causes physicists look for; but certainly they will never find them except in the ethereal matter for this evident reason, that it is the source of all motion, and nothing occurs except through motion.