Herbert Marcuse, lecture at FU West Berlin 1967, published in Five Lectures
Today any form of the concrete world, of human life, any transformation of the technical and natural environment is a possibility, and the locus of this possibility is historical. Today we have the capacity to turn the world into hell, and we are well on the way to doing so. We also have the capacity to turn it into the opposite of hell. This would mean the end of utopia, that is, the refutation of those ideas and theories that use the concept of utopia to denounce certain socio-historical possibilities. It can also be understood as the “end of history” in the very precise sense that the new possibilities for a human society and its environment can no longer be thought of as continuations of the old, nor even as existing in the same historical continuum with them. Rather, they presuppose a break with the historical continuum; they presuppose the qualitative difference between a free society and societies that are still unfree, which, according to Marx, makes all previous history only the prehistory of mankind.