
„[Democritus says:] By convention sweet is sweet, by convention bitter is bitter, by convention hot is hot, by convention cold is cold, by convention color is color. But in reality there are atoms and the void. That is, the objects of sense are supposed to be real and it is customary to regard them as such, but in truth they are not. Only the atoms and the void are real.“
— Democritus Ancient Greek philosopher, pupil of Leucippus, founder of the atomic theory
Source Book in Ancient Philosophy (1907), The Fragments