The first principles of the universe are atoms and empty space; everything else is merely thought to exist.
DemocritusThe man who is fortunate in his choice of son-in-law gains a son; the man unfortunate in his choice loses his daughter also.
DemocritusMoving in space, the atoms originally were individual units, but inevitable they began to collide with each other, and in cases where their shapes were such as to permit them to interlock, they began to form clusters. Water, air, fire, and earth, these are simply different clusters of the changeless atoms.
Democritus