The ontology of materialism rested upon the illusion that the kind of existence, the direct "actuality" of the world around us, can be extrapolated into the atomic range. This extrapolation is impossible, however.
Werner HeisenbergBy getting to smaller and smaller units, we do not come to fundamental or indivisible units. But we do come to a point where further division has no meaning.
Werner Heisenberg[T]he atoms or elementary particles themselves are not real; they form a world of potentialities or possibilities rather than one of things or facts.
Werner Heisenberg