Nature is an endless combination and repetition of a very few laws. She hums the old well-known air through innumerable variations.
Source: Essays, History (First Series), 1841.
-- Ralph Waldo Emerson, (May 25 1803-1882), US philosopher, poet, essayist; He was the main spokesman of his time for moral optimism and belief in the individual: Self-Reliance, 1844.