Nature

"I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority."
-E. B. White (1899 - 1985)

"The goal of life is living in agreement with nature."
-Zeno (335 BC - 264 BC), from Diogenes Laertius, Lives of Eminent Philosophers

"Nature does nothing uselessly."
-Aristotle (384 BC - 322 BC), Politics