Frank Wilczek Quote

For many centuries before modern science, and for the first two and a half centuries of modern science, the division of reality into matter and light seemed self-evident.... As long as the separation between the massive and the massless persisted, a unified description of the physical world could not be achieved.

Ch. 1, p. 9. - The Lightness of Being – Mass, Ether and the Unification of Forces (2008)