"History, the winnowing wind, never halts. We see the chaff rise, forget the waiting grain, seed of the future, fallen to the threshing floor. We never learn, but live on, slit-narrow, as if our living were a pencil line traced upon paper, behaving as trapped denizens of a flat world hemmed in by the bigoted horizon of our own making. Yet the meaning of living is a pushing back, a pulling down of the great walls and domes of fear and ignorance, is relinquishing the nest for the sky, ignorance for understanding. The look back is also a look forward."