The life in us is like the water in the river. It may rise this year higher than man has ever known it, and flood the parched uplands; even this may be the eventful year, which will drown out all our muskrats. It was not always dry land where we dwell. I see far inland the banks where the stream anciently washed, before science began to record its freshets.

Walden, Or, Life in the Woods (ed. Anchor Books, 1854)